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July 11, 2000
This document provides the current Catalyst 4840G server load balancing (SLB) switch software features and caveats for Cisco IOS Release 12.0(10)W5(18).
These release notes include the following sections:
The Catalyst 4840G SLB switch is a high-performance SLB Layer 3 switch.
SLB and Layer 3 switching refers to a class of high performance switches optimized for the campus LAN or intranet, providing both wirespeed Ethernet routing and switching services as well as SLB.
SLB handles the increasing number of visitors and data on your enterprise Web servers. These web servers must provide secure and reliable Web and application hosting services to your Internet or intranet clients.
The SLB switch redistributes the requests or hits from clients evenly among all the servers in the server farm and achieves a balanced load for each server in the server farm. Plus, all physical servers appear as one virtual server, resulting in only a single IP address and a single URL required for an entire server farm.
This section describes the system requirements for the Catalyst 4840G SLB switch for Cisco IOS Release 12.0(10)W5(18).
The standard default memory for the Catalyst 4840G SLB switch is 128 MB of SDRAM and 16 MB of onboard Flash ROM. No Flash memory (Flash PC) Card is installed by default. In a future software release the SLB switch can accept an optional 8-, 16-, or 20-MB Type II Flash PC Card.
The Catalyst 4840G SLB switch is a fixed configuration, Layer 3 10/100/1000 Ethernet SLB switch. There are 40 high-density 10/100Base-T Fast Ethernet and two GBIC Gigabit Ethernet interfaces on the SLB switch.
To determine the version of the Cisco IOS software currently running on the Catalyst 4840G SLB switch, log in to the SLB switch and enter the show version EXEC command.
Cisco IOS software is packaged in feature sets or software images that vary according to the platform. Table 1 lists the Cisco IOS software feature set available for the Catalyst 4840G SLB switch for Cisco IOS Release 12.0(10)W5(18).
| Feature Set |
|---|
| SLB Features |
Dispatch and Directed mode load balancing |
Round-robin and least connections server load balancing algorithms |
Sticky connections |
Buddy groups |
Direct server access |
Clients and servers can be in the same bridged domain as the load balancer |
Clients and servers can be routed to the load balancer |
40 Fast Ethernet server connections |
2 Gigabit Ethernet client connections |
One million simultaneous connections |
Unlimited virtual server addresses |
1024 real server connections |
Switch generated HTTP Health checks using HTTP Probe |
Dynamic Feedback Protocol (DFP) |
State-full Redundancy between Catalyst 4840G switches |
Hypertext Transfer Protocol (HTTP) |
Hypertext Transfer Protocol-Server (HTTP-S) |
Post Office Protocol 3 (POP3) |
Simple Mail Transfer Protocol (SMTP) |
Internet Message Access Protocol (IMAP) |
Remote Access Dial-In User Service (RADIUS) |
Domain Name System (DNS) |
Network News Transfer Protocol (NNTP) |
File Transfer Protocol (FTP) |
Stateful Backup |
| Layer 1 Features |
10/100Base-TX half duplex and full duplex |
1000Base-SX, LX, and long haul full duplex |
1000Base-ZX extended distance |
| Layer 2 Bridging Features |
Layer 2 transparent bridging |
Layer 2 MAC learning, aging, and switching by hardware |
Spanning Tree Protocol (IEEE 802.1D) per bridge group |
Support for a maximum of 16 active bridge groups |
Up to 4K MAC addresses |
Integrated routing and bridging (IRB) |
24K content addressable memory (CAM) is shared by Layer 2 entries and IP routing |
| Virtual LAN (VLAN) Features |
Inter-Switch Link (ISL)-based VLAN trunking |
802.1Q-based VLAN trunking |
| Layer 3 Routing, Switching, and Forwarding |
IP routing and switching between Ethernet interfaces |
24K content addressable memory (CAM) shared by Layer 2 entries and IP routing |
Up to 18K IP routes |
Up to 20K IP host entries |
Supported Routing Protocols |
Routing Information Protocol (RIP and RIP II) |
Interior Gateway Routing Protocol (IGRP) |
Enhanced Interior Gateway Routing Protocol (EIGRP) |
Open Shortest Path First (OSPF) |
Secondary addressing |
Static routes |
| Fast EtherChannel (FEC) Features |
Bundling of up to four Fast Ethernet interfaces |
Load sharing based on source and destination IP addresses of unicast packets |
Load sharing for bridge traffic based on MAC address |
Inter-Switch Link (ISL) on the Fast EtherChannel |
Integrated routing and bridging (IRB) on the Fast EtherChannel |
IEEE 802.1Q trunking on the Fast EtherChannel |
Up to 10 active FEC port channels |
| Gigabit EtherChannel (GEC) Features |
Bundling the two Gigabit Ethernet interfaces |
Load sharing based on source and destination IP addresses of unicast packets |
Load sharing for bridge traffic based on MAC address |
Inter-Switch Link (ISL) on the Gigabit EtherChannel |
Integrated routing and bridging (IRB) on the Gigabit EtherChannel |
IEEE 802.1Q trunking on the Gigabit EtherChannel |
One active GEC interface channels in one system |
| Additional Protocols and Features |
Bootstrap Protocol (BOOTP) |
Cisco Discovery Protocol (CDP) support on Ethernet interfaces |
Cisco Group Management Protocol (CGMP) server support |
Dynamic Host Configuration Protocol (DHCP) relay |
Hot Standby Routing Protocol (HSRP) over 10/100 Ethernet, Gigabit Ethernet, FEC, GEC, and Bridge Group Virtual Interface (BVI) |
Internet Control Message Protocol (ICMP) |
Internet Group Management Protocol (IGMP) |
Integrated routing and bridging (IRB) routing mode support |
Table 2 lists the features that are not supported on the Catalyst 4840G SLB switch.
Layer 2 source MAC address filtering with standard ACL |
Layer 3 filtering using ACL:
|
User Datagram Protocol (UDP) turbo flooding |
802.1Q bridging |
Border Gateway Protocol (BGP) |
Port-based snooping |
DEC spanning tree |
IPX routing |
AppleTalk 1 and 2 routing |
AppleTalk Routing Table Maintenance Protocol (RTMP) |
AppleTalk Update-based Routing Protocol (AURP) |
The following configuration limitations and restrictions apply to the Catalyst 4840G SLB switch:
Table 3 lists the caveats that were introduced and resolved on the Catalyst 4840G SLB switch for Cisco IOS Release 12.0(10)W5(18). In Table 3, "Y" indicates a fixed caveat and "N" indicates an open caveat.
| DDTS Number | Software Release |
|---|---|
| 12.0(10)W5(18) | |
| Corrected | |
N | |
N | |
N |
This section describes the documentation available for the Catalyst 4840G SLB Switch. Both printed manuals and electronic documents are available.
The most current documentation is available on Cisco Connection Online (CCO) and the Documentation CD-ROM. These electronic documents might contain updates and modifications made after the hard-copy documents were printed.
Use these release notes with the following documents:
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This document is to be used in conjunction with the documents listed in the "Related Documentation" section.
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