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July 24, 2000
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Note You can find the most current Cisco IOS documentation on Cisco Connection Online (CCO ). These electronic documents may contain updates and modifications made after the hardcopy documents were printed. |
These release notes for the Cisco 2500 series routers describe the enhancements provided in Cisco IOS Release 12.1 T. These release notes are updated as needed.
For a list of the software caveats that apply to Cisco IOS Release 12.1 T, see Caveats for Cisco IOS Release 12.1 T that accompanies these release notes. The caveats document is updated for every maintenance release and is located on Cisco Connection Online (CCO) and the Documentation CD-ROM.
Use these release notes with Cross-Platform Release Notes for Cisco IOS Release 12.1 on CCO and the Documentation CD-ROM.
These release notes describe the following topics:
These release notes describe the Cisco 2500 series routers for Cisco IOS Release 12.1 T, which is an early deployment (ED) release based on Cisco IOS Release 12.1. Early deployment releases contain fixes for software caveats and support for new Cisco hardware and software features. The following lists shows the recent early deployment releases of the Cisco 2500 series routers:
For more information, see the "Platform-Specific Documents" section about accessing related release note documents.
This section describes the system requirements for Cisco IOS Release 12.1 T:
| Feature Sets | Image Name | Software Image | Recommended Flash Memory | Recommended DRAM Memory | Runs from |
|---|---|---|---|---|---|
IP Feature Sets | IP | c2500-i-l | 16 MB | 10 MB | Flash |
IP/FW | c2500-io-l | 16 MB | 101 MB | Flash | |
IP/FW Plus IPSec 56 | c2500-ios56i-l | 16 MB | 10 MB | Flash | |
IP Plus | c2500-is-l | 16 MB | 10 MB | Flash | |
IP Plus IPSec 56 | c2500-is56i-l | 16 MB | 10 MB | Flash | |
IP/H323 | c2500-ix-l | 16 MB | 16 MB | Flash | |
IP/IBM/SNASW | c2500-a3i3r4-l | 16 MB | 16 MB | Flash | |
IP/IPX/AT/DEC | c2500-d-l | 16 MB | 8 MB | Flash | |
IP/IPX/AT/DEC/FW Plus | c2500-dos-l | 16 MB | 10 MB | Flash | |
IP/IPX/AT/DEC Plus | c2500-ds-l | 16 MB | 8 MB | Flash | |
Enterprise | Enterprise/FW Plus IPSec 56 | c2500-jos56i-l | 16 MB | 16 MB | Flash |
Enterprise Plus | c2500-js-l | 16 MB | 10 MB | Flash | |
Enterprise Plus IPSec 56 | c2500-js56i-l | 16 MB | 16 MB | Flash | |
FRAD | FRAD | c2500-f-l | 8 MB | 8 MB | Flash |
LAN FRAD/OSPF | c2500-f2in-l | 8 MB | 8 MB | Flash | |
LAN FRAD | c2500-fin-l | 8 MB | 8 MB | Flash | |
| Remote Access Server (RAS) | c2500-c-l | 16 MB | 8 MB | Flash |
| ISDN | c2500-g-l | 8 MB | 8 MB | Flash |
| Service Provider with PT/TARP2 | c2500-p7-l | 8 MB | 4 MB | Flash |
| 116 MB in Release 12.1(1)T. 2This image was introduced in Cisco IOS Release 12.1(3)T. It is not supported in previous releases. |
Cisco IOS Release 12.1 T supports the Cisco 2500 series routers:
For detailed descriptions of the new hardware features, see "New and Changed Information" section.
| Interface, Network Module, or Data Rate | Product Description | Platforms Supported |
|---|---|---|
| LAN Interfaces | Ethernet (AUI) | Cisco 2501, 2503, 2509, 2511, 2513, 2514, 2520, 2522, and 2524 only |
Ethernet (10BaseT) | Cisco 2505, 2507, 2516, and 2524 only | |
4-Mbps Token Ring | Cisco 2502, 2504, 2513, 2515, 2521, 2523, and 2525 only | |
16-Mbps Token Ring | Cisco 2502, 2504, 2513, 2515, 2521, 2523, and 2525 only) | |
| WAN Data Rates | 48/56/64 kbps | Cisco 2500 series |
128 kbps | Cisco 2500 series | |
1.544/2.048 Mbps | Cisco 2500 series | |
| WAN Interfaces | EIA/TIA-232 | Cisco 2500 series |
EIA/TIA-449 | Cisco 2500 series | |
EIA-530 | Cisco 2500 series | |
X.21 | Cisco 2500 series | |
V.35 | Cisco 2500 series | |
Serial, synchronous | Cisco 2500 series | |
Serial, synchronous, and asynchronous | Cisco 2520, 2521, 2522, and 2523 only | |
ISDN BRI S/T | Cisco 2503, 2504, 2516, 2520, 2521, 2522, 2523, 2524, and 2525 only | |
ISDN BRI U | Cisco 2524 and 2525 only |
To determine the version of Cisco IOS software running on your Cisco 2500 series router, log in to the router and enter the show version EXEC command:
router> show version Cisco Internetwork Operating System Software IOS (tm)12.1 TSoftware (C2500-DOS-L), Version12.1(3)T, RELEASE SOFTWARE
For general information about upgrading to a new software release, see Cisco IOS Upgrade Ordering Instructions located at:
http://www.cisco.com /warp/public/cc/cisco /mkt/ios/prodlit /957_pp.htm
The Cisco IOS software is packaged in feature sets consisting of software images--depending on the platform. Each feature set contains a specific set of Cisco IOS features.
Cisco IOS Release 12.1 T supports the same feature sets as Cisco IOS Release 12.1, but Release 12.1 T can include new features supported by the Cisco 2500 series routers.
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Caution Cisco IOS images with strong encryption (including, but not limited to 168-bit (3DES) data encryption feature sets) are subject to United States government export controls and have limited distribution. Strong encryption images to be installed outside the United States are likely to require an export license. Customer orders may be denied or subject to delay due to United States government regulations. When applicable, purchaser/user must obtain local import and use authorizations for all encryption strengths. Please contact your sales representative or distributor for more information, or send an e-mail to export@cisco.com. |
Table 3, Table 4, and Table 5 list the features and feature sets supported by the Cisco 2500 series routers in Cisco IOS Release 12.1 T and use the following conventions:
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Note These feature set tables contain only the features specific to the T-train. For a more complete list of features, see the feature set tables in the mainline release notes on CCO: http://www.cisco.com /univercd/cc/td/doc/product/ software/ios121/121relnt/ xprn121/121 feats.htm. |
| Feature Sets | |||||||
|---|---|---|---|---|---|---|---|
| Features | In | IP | IP/FW | IP/FW Plus IPSec 56 | IP Plus | IP Plus IPSec 56 | IP/H323 |
| Configuration Fundamentals |
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| (3) | Yes | Yes | Yes | Yes | Yes | Yes |
| (3) | Yes | Yes | Yes | Yes | Yes | Yes |
| (3) | Yes | Yes | Yes | Yes | Yes | Yes |
| IP Multicast |
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| (2) | Yes | Yes | Yes | Yes | Yes | Yes |
| (3) | Yes | Yes | Yes | Yes | Yes | Yes |
| IP Routing Protocols |
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| (2) | Yes | Yes | Yes | Yes | Yes | Yes |
| Management |
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| Yes | Yes | Yes | Yes | Yes | Yes |
| Miscellaneous |
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| Yes | Yes | Yes | Yes | Yes | Yes |
| Multiservice Applications--Voice |
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| (2) | No | No | No | No | No | Yes |
| Quality of Service |
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| Yes | Yes | Yes | Yes | Yes | Yes |
| Reliability |
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| No | No | No | No | No | No |
| WAN |
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| (3) | Yes | Yes | Yes | Yes | Yes | Yes |
| (2) | Yes | Yes | Yes | Yes | Yes | Yes |
| Feature Sets | |||||||
|---|---|---|---|---|---|---|---|
| Features | In | IP/IBM/ SNASW | IP/IPX/AT/ DEC | IP/IPX/AT/ DEC/FW Plus | IP/IPX/AT/ DEC Plus | Enterprise/ FW Plus IPSec 56 | Enterprise Plus |
| Configuration Fundamentals |
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| (3) | Yes | Yes | Yes | Yes | Yes | Yes |
| (3) | Yes | Yes | Yes | Yes | Yes | Yes |
| (3) | Yes | Yes | Yes | Yes | Yes | Yes |
| IP Multicast |
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| (2) | Yes | Yes | Yes | Yes | Yes | Yes |
| (3) | Yes | Yes | Yes | Yes | Yes | Yes |
| IP Routing Protocols |
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| (2) | Yes | Yes | Yes | Yes | Yes | Yes |
| Management |
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| Yes | Yes | Yes | Yes | Yes | Yes |
| Miscellaneous |
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| Yes | Yes | Yes | Yes | Yes | Yes |
| Multiservice Applications--Voice |
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| (2) | No | No | No | No | No | No |
| Quality of Service |
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| Yes | Yes | Yes | Yes | Yes | Yes |
| Reliability |
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| No | No | No | No | Yes | Yes |
| WAN |
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| (3) | Yes | Yes | Yes | Yes | Yes | Yes |
| (2) | Yes | Yes | Yes | Yes | Yes | Yes |
| Feature Sets | ||||||||
|---|---|---|---|---|---|---|---|---|
| Features | Enter- prise Plus IPSec 56 | FRAD | LAN FRAD/ OSPF | LAN FRAD | Remote Access Server (RAS) | ISDN | Service Provider with PT/TARP1 | |
| Configuration Fundamentals |
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| (3) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| (3) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| (3) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| IP Multicast |
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| (2) | Yes | No | No | No | No | No | Yes |
| (3) | Yes | No | No | No | Yes | Yes | Yes |
| IP Routing Protocols |
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| (2) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Management |
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| Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Miscellaneous |
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| Yes | No | No | No | Yes | Yes | Yes |
| Multiservice Applications--Voice |
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| (2) | No | No | No | No | No | No | Yes |
| Quality of Service |
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| Yes | No | No | No | Yes | No | Yes |
| Reliability |
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| Yes | No | No | No | No | No | Yes |
| WAN |
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| (3) | Yes | Yes | Yes | Yes | Yes | No | Yes |
| (2) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| 1This image was introduced in Cisco IOS Release 12.1(3)T. It is not supported in previous releases. |
The following sections list the new hardware and software features supported by the Cisco 2500 series routers for Release 12.1 T.
The following new software features are supported by the Cisco 2500 series routers for Release 12.1(3)T:
The Circuit Interface Description MIB feature adds support for a new Cisco enterprise MIB, used for monitoring individual circuits using SNMP. The Circuit Interface MIB (CISCO-CIRCUIT-INTERFACE-MIB) provides a MIB object which can be used to provide a description of individual circut-based interfaces (for example, interfaces using ATM or Frame-Relay). This description will then be returned when linkup and linkdown SNMP traps are generated for the described interface.
The Circuit Interface MIB consits of a single table, with each row being a sequence of two objects: Circuit Interface Description (cciDescr) and Circuit Interface Status (cciStatus).
The cciDescr object is used to identify circuits using a textual description of up to 255 characters specified by the user (note that MIB objects are modified using network managment system (NMS) applications, and can not be configured using the Cisco IOS command-line interface). When the row is created by a user, a value is set for the cciDescr object. The table is indexed by ifIndex from the IF-MIB. The cciStatus is the RowStatus object for the rows in the table.
The cciStatus object can be set to only two values by the user: createAndGo(4), which creates a new row, and destroy(6), which removes an exisiting row. If the row is created successfully, the cciStatus will be active(1). When creating a new row, the user should set the cciDescr object along with the cciStatus in a single snmp set pdu command. If the row is already active, only the cciDescr object can be modified. The other option is to delete the row first by setting the cciStatus to destroy(6) and then recreate the row with a new value for cciDescr. When creating a new row, the ifIndex is validated first. If the ifIndex value is not valid, the row is not created and an error code is returned. Similarly, if ,when an interface is deleted, there was a corresponding row in this table, that row will be deleted automatically.
After a description is created for an interface, the description (the cciDescr object) will be sent along with the other varbinds as part of linkup and linkdown trap notifications.
The Event MIB is an asynchronous notification mechanism standardized for use by network management systems using Simple Network Management Protocol (SNMP). The Event MIB provides the ability to monitor Management Information Base (MIB) objects on a local or remote system using SNMP and initiate simple actions whenever a trigger condition is met (for example, an SNMP trap can be generated when an object is modified). By allowing notifications based on events, the Network Management System (NMS) does not need to constantly poll managed devices to find out if something has changed.
When combined with the Expression MIB support introduced in Cisco IOS Release 12.0(5)T, Event MIB support in Cisco IOS software provides a flexible and efficient way to monitor complex conditions on network devices.
The Frame Relay ELMI Address Registration feature enables a network management system (NMS) to detect connectivity among the switches and routers in a network using the Enhanced Local Management Interface (ELMI) protocol. During ELMI version negotiation, neighboring devices exchange their management IP addresses and ifIndex. The NMS polls the devices to collect this connectivity information.
Before this feature was introduced, NMS could detect only the topology of routers or the topology of switches. The NMS could not detect router and switch interconnection and was therefore unable to create a complete topology of the network. With the Frame Relay ELMI Address Registration feature, the NMS can detect switch and router interconnection and create an end-to-end network topology map for network administrators.
The Cisco Frame Relay MIB has been enhanced to support the new ELMI information. The NMS uses the MIB to extract the IP address and ifIndex of devices neighboring the managed device.
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Note The ELMI address registration mechanism does not check for duplicate or illegal addresses. |
ELMI address registration takes place on all interfaces on which ELMI is enabled, even if all the interfaces are connected to the same router or switch. The router periodically sends a version inquiry message with version information, the management IP address, and ifIndex to the switch. The switch sends its management IP address and ifIndex using the version status message. When the management IP address of the switch changes, an asynchronous ELMI version status message is sent to the neighboring device immediately.
When ELMI is enabled, the router automatically chooses the IP address of one of the interfaces to use for ELMI address registration purposes. The router will choose the IP address of an Ethernet interface first, and then serial and other interfaces. You have the option to use the IP address chosen by the router or to disable the autoaddress mechanism and configure the management IP address yourself. You can also choose to disable ELMI address registration on a specific interface or on all interfaces.
The Individual SNMP Trap Support Feature adds the ability to enable or disable SNMP system management notifications (traps) individually. SNMP traps that can be specified are authentication-failure, linkup, linkdown, and coldstart. This feature expands the functionality of the snmp-server enable traps snmp command. Prior to the introduction of this feature, all four trap types were enabled or disabled simultaneously by the snmp-server enable traps snmp command.
Individual SNMP Trap Support is supported for all versions of SNMP supported by Cisco IOS software (SNMPv1, SNMPv2c, and SNMPv3).
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Note As both SNMP traps and informs are enabled or disabled thorough the use of the snmp-server enable traps command, all references to traps in this document also apply to informs. The term "notifications" is used to refer to both traps and informs. |
The Source Specific Multicast feature is an extension of IP multicast where datagram traffic is forwarded to receivers from only those multicast sources to which the receivers have explicitly joined. When SSM is used, only source-specific multicast distribution trees (no shared trees) are created.
Source specific multicast (SSM) is a datagram delivery model that best supports one-to-many applications, also known as broadcast applications. SSM is the core networking technology for the Cisco implementation of the IP Multicast lite suite of solutions targeted for audio and video broadcast application environments.
The following new software features are supported by the Cisco 2500 series routers for Release 12.1(2)T:
Bidir-PIM is a variant of the Protocol Independent Multicast (PIM) suite of routing protocols for IP multicast. In PIM, packet traffic for a multicast group is routed according to the rules of the mode configured for that multicast group. The Cisco IOS implementation of PIM supports three modes for a multicast group:
A router can simultaneously support all three modes or any combination of them for different multicast groups. In bidirectional mode, traffic is only routed along a bidirectional shared tree that is rooted at the rendezvous point (RP) for the group. In bidir-PIM, the IP address of the RP acts as the key to having all routers establish a loop-free spanning tree topology rooted in that IP address. This IP address does not need to be a router, but can be any unassigned IP address on a network that is reachable throughout the PIM domain. Using this technique is the preferred configuration for establishing a redundant RP configuration for bidir-PIM.
Membership to a bidirectional group is signalled via explicit Join messages. Traffic from sources is unconditionally sent up the shared tree toward the RP and passed down the tree toward the receivers on each branch of the tree.
Bidir-PIM is designed to be used for many-to-many applications within individual PIM domains. Multicast groups in bidirectional mode can scale to an arbitrary number of sources without incurring overhead due to the number of sources.
Bidir-PIM is derived from the mechanisms of PIM sparse mode (PIM SM) and shares many SPT operations. Bidir-PIM also has unconditional forwarding of source traffic toward the RP upstream on the shared tree, but no registering process for sources as in PIM SM. These modifications are necessary and sufficient to allow forwarding of traffic in all routers solely based on the (*, G) multicast routing entries. This feature eliminates any source-specific state and allows scaling capability to an arbitrary number of sources.
The Frame Relay Switching Enhancements feature enables a router in a Frame Relay network to be used as a Frame Relay switch.
This feature includes the following Frame Relay switching enhancements:
Before the Frame Relay Switching Enhancements feature was introduced, routers had limited Frame Relay switching functionality. With this feature, a router acting as a virtual Frame Relay switch can be configured to do the following:
The Gatekeeper to Gatekeeper Redundancy and Load-Sharing Mechanism feature expands the capability that is provided by the Redundant H.323 Zone Support feature. With the Redundant H.323 Zone Support feature, the LRQs are sent simultaneously (in a "blast" fashion) to all of the gatekeepers in the list. The gateway registers with the gatekeeper that responds first. Then, if that gatekeeper becomes unavailable, the gateway registers with another gatekeeper from the list.
The Gatekeeper to Gatekeeper Redundancy and Load-Sharing Mechanism feature enhances this capability by allowing the user to choose whether the LRQs are sent simultaneously or sequentially (one-at-a-time) to the remote gatekeepers in the list. If the LRQs are sent sequentially, a delay is inserted after the first LRQ and before the next LRQ is sent. This delay allows the first gatekeeper to respond before the LRQ is sent to the next gatekeeper. The order in which LRQs are sent to the gatekeepers is based on the order in which the gatekeepers are listed (using either the zone prefix or the gw-type-prefix command).
The explosive growth of the Internet has placed the focus on the scalability of Interior Gateway Protocols such as OSPF. The networks using OSPF are becoming larger every day and will continue to expand to accommodate the demand to connect to the Internet.
Internet Service Providers and customers with large networks have regularly complained that OSPF has a traffic overhead, even when the network topology is stable.
By design, OSPF requires link-state advertisements (LSAs) to be refreshed as they expire after 3600 seconds. Some implementations have tried to improve the flooding by reducing the frequency to refresh from 30 min to around 50 min or so.
This solution reduces the amount of refresh traffic but requires at least one refresh before the LSA expires. The OSPF Flooding Reduction feature works by reducing unnecessary refreshing and flooding of already known and unchanged information. To achieve this reduction, the LSAs are now flooded with the higher bit set, thus making them DoNotAge (DNA) LSAs.
The following new software features are supported by the Cisco 2500 series routers for Release 12.1(1)T:
As of Cisco IOS Release 12.0(7)T, if TCP or :RTP header compression is enabled, it occurs by default in the fast-switched path or the Cisco Express Forwarding-switched (CEF-switched) path, depending on which switching method is enabled on the interface. Furthermore, the number of TCP and RTP header compression connections is increased to 1000 connections each.
Prior to this feature, such compression was performed in the process-switching path. That meant that packets traversing interfaces that had ::TCP or RTP :: header compression enabled were queued and passed up to the process to be switched. This procedure slowed down transmission of the packet, and therefore, some users preferred to fast switch uncompressed TCP and RTP packets.
Pragmatic General Multicast (PGM) is a reliable multicast transport protocol for multicast applications that require reliable, ordered, duplicate-free multicast data delivery from multiple sources to multiple receivers. PGM guarantees that a receiver in a multicast group either receives all data packets from transmissions and retransmissions, or can detect unrecoverable data packet loss. PGM is intended as a solution for multicast applications with basic reliability requirements. PGM has two main parts: a host element (also referred to as the transport layer of the PGM protocol) and a network element (also referred to as the network layer of the PGM protocol).
The transport layer of the PGM protocol consists of two main parts: a source part and a receiver part. The transport layer defines how multicast applications send and receive reliable, ordered, duplicate-free multicast data from multiple sources to multiple receivers. The PGM Host feature is the Cisco implementation of the transport layer of the PGM protocol.
The Service Assurance (SA) Agent is an both an enhancement to and a new name for the Response Time Reporter (RTR) feature that was introduced in Cisco IOS Release 11.2. The feature allows you to monitor network performance between a Cisco router and a remote device (which can be another Cisco router, an IP host, or a mainframe host) by measuring key Service Level Agreement (SLA) metrics such as response time, network resources, availability, jitter, connect time, packet loss and application performance.This feature enables you to perform troubleshooting, problem analysis, and notifications based on the statistics collected by the SA Agent.
The SA Agent Enhancements feature introduces new performance measurement operations and enhancements to assist in the measurement of SLAs. With Cisco IOS Release 12.1(1)T, the SA Agent provides new capabilities that enable you to do the following:
The state-refresh command prevents the periodic timeout of prune state in routers, greatly reducing the reflooding of multicast traffic down the pruned branches that expire periodically. It also causes topology changes to be realized quicker than the traditional three-minute timeout.
Old Cisco Management Information Bases (MIBs) will be replaced in a future release. Currently, OLD-CISCO-* MIBs are being converted into more scalable MIBs--without affecting existing Cisco IOS products or NMS applications. You can update from deprecated MIBs to the replacement MIBs as shown in Table 6.
| Deprecated MIB | Replacement |
|---|---|
OLD-CISCO-APPLETALK-MIB | RFC1243-MIB |
OLD-CISCO-CHASSIS-MIB | ENTITY-MIB |
OLD-CISCO-CPUK-MIB | To be decided |
OLD-CISCO-DECNET-MIB | To be decided |
OLD-CISCO-ENV-MIB | CISCO-ENVMON-MIB |
OLD-CISCO-FLASH-MIB | CISCO-FLASH-MIB |
OLD-CISCO-INTERFACES-MIB | IF-MIB CISCO-QUEUE-MIB |
OLD-CISCO-IP-MIB | To be decided |
OLD-CISCO-MEMORY-MIB | CISCO-MEMORY-POOL-MIB |
OLD-CISCO-NOVELL-MIB | NOVELL-IPX-MIB |
OLD-CISCO-SYS-MIB | (Compilation of other OLD* MIBs) |
OLD-CISCO-SYSTEM-MIB | CISCO-CONFIG-COPY-MIB |
OLD-CISCO-TCP-MIB | CISCO-TCP-MIB |
OLD-CISCO-TS-MIB | To be decided |
OLD-CISCO-VINES-MIB | CISCO-VINES-MIB |
OLD-CISCO-XNS-MIB | To be decided |
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Note Cisco Management Information Base (MIB) User Quick Reference is no longer published. If you have an account with CCO, you can find the current list of MIBs supported by Cisco. To reach the Cisco Network Management Toolkit, go to CCO, press Login, and click to Software Center: Network Mgmt Products: Cisco Network Management Toolkit: Cisco MIB. |
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious.
For information on caveats in Cisco IOS Release 12.1 T, see Caveats for Cisco IOS Release 12.1 T.
All caveats in Cisco IOS Release 12.1 are also in Cisco IOS Release 12.1 T.
For information on caveats in Cisco IOS Release 12.0, see Caveats for Cisco IOS Release 12.1, which lists severity 1 and 2 caveats and is located on CCO and the Documentation CD-ROM.
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Note If you have an account with CCO, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to CCO and press Login. Then go to Software Center: Cisco IOS Software: Cisco Bugtool Navigator II. Another option is to go to http://www.cisco.com/support/bugtools. |
This section describes possibly unexpected behavior by Release 12.1(2)T, specific to the Cisco 2500 series routers. Only severity 1 and 2 caveats are included.
A defect in Cisco IOS software will cause a Cisco router or switch to halt and reload if the IOS HTTP service is enabled and browsing to "http://<router-ip>/%%" is attempted. This defect can be exploited to produce a denial of service (DoS) attack.
The vulnerability, identified as Cisco bug ID CSCdr36952, affects virtually all mainstream Cisco routers and switches running Cisco IOS Releases 11.1 through 12.1, inclusive. The vulnerability has been corrected, and Cisco is making fixed releases available to replace all affected IOS releases. Customers are urged to upgrade to releases that are not vulnerable to this defect as shown in detail below.
The vulnerability can be mitigated by disabling the IOS HTTP server, using an access-list on an interface in the path to the router to prevent unauthorized network connections to the HTTP server, or applying an access-class option directly to the HTTP server itself. The IOS HTTP server is enabled by default only on Cisco 1003, 1004, and 1005 routers that are not configured. In all other cases, the IOS http server must be explicitly enabled in order to exploit this defect.
The complete advisory, including software fixes and workarounds, is available at:
http://www.cisco.com/warp/public/707/ioshttpserver-pub.shtml .
The following sections describe the documentation available for the Cisco 2500 series routers. These documents consist of hardware and software installation guides, Cisco IOS configuration and command references, system error messages, feature modules, and other documents.
Documentation is available as printed manuals or electronic documents, except for feature modules, which are available online on CCO and the Documentation CD-ROM.
Use these release notes with these documents:
The following documents are specific to Cisco IOS Release 12.1 and are located on CCO and the Documentation CD-ROM:
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Note If you have an account with CCO, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to CCO and press Login. Then go to Software Center: Cisco IOS Software: Cisco Bugtool Navigator II. Another option is to go to http://www.cisco.com/support/bugtools. |
These individual and groups of documents are available for the Cisco 2500 series routers on CCO and the Documentation CD-ROM:
On CCO at:
Technical Documents: Documentation Home Page: Cisco Product Documentation: Access Servers and Access Routers: Modular Access Routers: Cisco 2500 Series Routers
On the Documentation CD-ROM at:
Cisco Product Documentation: Access Servers and Access Routers: Modular Access Routers: Cisco 2500 Series Routers
Feature modules describe new features supported by Cisco IOS Release 12.1 T and are updates to the Cisco IOS documentation set. A feature module consists of a brief overview of the feature, benefits, configuration tasks, and a command reference. As updates, the feature modules are available online only. Feature module information is incorporated in the next printing of the Cisco IOS documentation set.
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: New Feature Documentation
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: New Feature Documentation
The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS command references, and several other supporting documents that are shipped with your order in electronic form on the Documentation CD-ROM--unless you specifically ordered the printed versions.
Each module in the Cisco IOS documentation set consists of two books: a configuration guide and a corresponding command reference. Chapters in a configuration guide describe protocols, configuration tasks, Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference.
On CCO and the Documentation CD-ROM, two master hot-linked documents provide information for the Cisco IOS software documentation set.
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Configuration Guides and Command References
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Configuration Guides and Command References
Table 7 describes the contents of the Cisco IOS Release 12.1 software documentation set, which is available in electronic form and in printed form ordered.
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Note You can find the most current Cisco IOS documentation on CCO and the Documentation CD-ROM. These electronic documents may contain updates and modifications made after the hard-copy documents were printed. |
On CCO at:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1
On the Documentation CD-ROM at:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1
| Books | Major Topics |
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| Cisco IOS User Interfaces |
| Using Cisco IOS Software |
| Preparing for Dial Access |
| Interface Configuration Overview |
| IP Addressing and Services |
| AppleTalk and Novell IPX Overview |
| Apollo Domain, Banyan VINES, DECnet, ISO CLNS, and XNS Overview |
| Multiservice Applications Overview |
| Quality of Service Overview |
| Security Overview |
| Cisco IOS Switching Services Overview |
| Wide-Area Networking Overview |
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Note Cisco Management Information Base (MIB) User Quick Reference is no longer published. If you have an account with CCO, you can find the current list of MIBs supported by Cisco. To reach the Cisco Network Management Toolkit, go to CC, press Login, and click to Software Center: Network Mgmt Products: Cisco Network Management Toolkit: Cisco MIB. |
You can access the most current Cisco documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly. Therefore, it is probably more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.
Registered CCO users can order the Documentation CD-ROM and other Cisco Product documentation through our online Subscription Services at http://www.cisco.com/cgi-bin/subcat/kaojump.cgi.
Nonregistered CCO users can order documentation through a local account representative by calling Cisco's corporate headquarters (California, USA) at 408 526-4000 or, in North America, call 800 553-NETS (6387).
Cisco provides Cisco Connection Online (CCO) as a starting point for all technical assistance. Warranty or maintenance contract customers can use the Technical Assistance Center. All customers can submit technical feedback on Cisco documentation using the web, e-mail, a self-addressed stamped response card included in many printed documents, or by sending mail to Cisco.
Cisco continues to revolutionize how business is done on the Internet. Cisco Connection Online is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.
CCO's broad range of features and services helps customers and partners to streamline business processes and improve productivity. Through CCO, you will find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online support services, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.
Customers and partners can self-register on CCO to obtain additional personalized information and services. Registered users may order products, check on the status of an order and view benefits specific to their relationships with Cisco.
You can access CCO in the following ways:
You can e-mail questions about using CCO to cco-team@cisco.com.
The Cisco Technical Assistance Center (TAC) is available to warranty or maintenance contract customers who need technical assistance with a Cisco product that is under warranty or covered by a maintenance contract.
To display the TAC web site that includes links to technical support information and software upgrades and for requesting TAC support, use www.cisco.com/techsupport.
To contact by e-mail, use one of the following:
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In North America, TAC can be reached at 800 553-2447 or 408 526-7209. For other telephone numbers and TAC e-mail addresses worldwide, consult the following web site: http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml.
If you have a CCO log-in account, you can access the following URL, which contains links and tips on configuring your Cisco products:
http://www.cisco.com/kobayashi/technotes/serv_tips.shtml
This URL is subject to change without notice. If it changes, point your Web browser to CCO, press Login, and click on this path: Technical Assistance Center: Technical Tips.
The following sections are provided from the Technical Tips page:
If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco.
You can e-mail your comments to bug-doc@cisco.com.
To submit your comments by mail, for your convenience many documents contain a response card behind the front cover. Otherwise, you can mail your comments to the following address:
Cisco Systems, Inc.
Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883
We appreciate and value your comments.
Posted: Tue Aug 8 16:32:28 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.