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This chapter describes how to configure the synchronous serial interfaces on the Cisco Optical Networking System (ONS) 15304 platform. The Cisco ONS 15304 supports up to 21 high-speed synchronous serial interfaces, each of which operates at the E1 full-duplex payload rate of 2.048 Mbps.
Each of these 21 synchronous serial interfaces support HDLC-framed link layer protocols, including in particular Point-to-Point Protocol (PPP) and Multilink PPP. Cisco recommends PPP and Multilink PPP as the link layer protocols for the Cisco ONS 15304.
Before describing the configuration process, it is important to note the terminology used here as it relates to the E1 subsystem and the synchronous serial interfaces:
The Cisco ONS 15304 requires two separate configuration steps for each serial interface. The first step consists of configuring the serial interface with standard Cisco IOS commands. The second step uses the Cisco ONS 15304 specific INE commands. The first step is used to assign the serial interface to a Multilink PPP bundle. The second step allows for the actual cross-connect between the serial interface and a VC-12. If either of these steps is missed, traffic will not be forwarded between the Ethernet ports and the VC-12s.
This section describes the configuration of the synchronous serial interfaces, without describing PPP and Multilink PPP configuration in detail. Refer to "Configuring PPP and Multilink PPP" for information regarding configuration of the PPP and Multilink PPP link layer protocols.
For brevity, in the remainder of this chapter, the term "serial interface" is used to refer to "synchronous serial interfaces." The Cisco ONS 15304 supports only synchronous interfaces.
For hardware technical descriptions and information about installing interfaces, refer to the Cisco Optical Networking System 15304 Hardware Installation Guide. For a complete description of serial interface commands used in this chapter, refer to the "Interface Commands" chapter of the Configuration Fundamentals Command Reference. To locate documentation of other commands that appear in this chapter, use the command reference master index or search online.
The first part of the serial interface configuration is to assign the serial E1 interfaces to a multilink bundle. This part of the configuration determines the amount of bandwidth that will be available in the multilink bundle. Because there can be up to 8 links in a bundle, it is possible to assign any 8 of the 21 available serial interfaces to a multilink bundle. See Table 6-1.
To configure the serial E1 interfaces (IOS) perform the following procedure:
| Step | Prompt and Command |
|---|---|
Step 1 Access the config mode. | ONS# configure terminal |
Step 2 Select an interface to configure. The range is 1 through 21. | ONS(config)# interface seriale1 <1-21> |
Step 3 The default encapsulation is HDLC. It is not necessary to change this encapsulation if the serial interface will not be part of a multilink bundle. If the interface will be part of a multilink bundle, the encapsulation should be changed to ppp. | ONS(config-if)# encapsulation {hdlc | ppp} |
| Note If HDLC is the chosen encapsulation, skip to step 7 to set up an IP address for routing traffic to the interface or skip to step 8 for bridging traffic to the interface. | |
Step 4 Turn multilink PPP on. | ONS(config-if)# ppp multilink |
Step 5 Assign the interface to a multilink group. Groups are identified using numbers 1-8. | ONS(config-if)# multilink-group 1-8 |
Step 6 Assign a ppp chap hostname to the interface. This hostname should match the hostname used by the near end multilink bundle and the far end multilink bundle. | ONS(config-if)# ppp chap hostname WORD |
Step 7 This step is optional and should only be performed when routing is necessary between an Ethernet interface and one serial interface. Assign an IP address to the interface. | ONS(config-if) ip-address host address subnet mask |
Step 8 This step is optional and should only be performed when bridging is necessary between an Ethernet interface and one serial interface. Assign a bridge-group to the interface. Bridge-groups are identified by a number in the range of 1 through 8. | ONS(config-if) bridge-group 1-8 |
Step 9 After all configuration data has been entered for the multilink bundle, the corresponding serial interface (INE), and the cross-connect, administratively put the port in-service. | ONS(config-if)# no shutdown |
Step 10 Repeat these steps for each serial interface. |
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For explanations of the commands listed above, refer to the command handbook.
Upon completion of the steps listed above, the configuration file should resemble the following for each serial interface entered:
Example 1 - Configuration using Multilink PPP:
interface serial e1 1 no shutdown no ip address encapsulation ppp multilink ppp multilink group 1 chap hostname group1
Example 2 - Configuration for a single serial interface with an IP address:
interface serial e1 1 no shutdown ip address 192.168.0.0 255.255.0.0 encapsulation ppp multilink ppp multilink group 1 chap hostname group1
Example 3 - Configuration for a single serial interface assigned to a bridge-group:
interface serial e1 1 no shutdown no ip address encapsulation ppp multilink ppp multilink group 1 chap hostname group1 bridge-group 1
The second part of the serial interface configuration is to create the serial E1 interfaces (INE). This part of the configuration allows the serial interfaces to be cross-connected to VC-12s. For each serial interface configured using Cisco IOS commands, there should be a serial interface (INE) and they should be identified by the same number. For example, interface seriale1 3 is logically the same interface as ine enter seriale1 3.
To configure the serial E1 interfaces (INE) perform the procedure in Table 6-2:
| Step | Prompt and Command |
|---|---|
Step 1 Access the config mode. | ONS# configure terminal |
Step 2 Select an interface to administratively place in-service. The range is 1-21. For a list of other options that can be set prior to placing the port in-service, refer to the "Commands for Serial E1 Ports (INE)" listed on. | ONS(config)# ine enter seriale1 1-21 admin is |
Step 3 Repeat these steps for each serial interface. |
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Upon completion of the steps listed above, the configuration should resemble the following:
ine enter seriale1 1 admin is
(config)#ine enter seriale1 se1-range
fac-id string
[framing {cept-no-crc | cept-crc4 | unframed}]
[fm-rept {on | off}]
[almpfl {profile-number}]
[tca-rept {on | off}]
[gos 1]
[delay date time]
[trig time]
[admin {is | oos}]
[timing {loop | system}]
[ts16 {data | idle}]
| Parameters | Description |
|---|---|
seriale1 | Serial E1 port where Ethernet traffic gets framed in E1 format. The field se1-range can be a single number in the range 1 to 21 OR a combination of numbers in the range 1 to 21 delineated by commas, (for example 3,15,17) OR a range of numbers in the range 1 to 21 (for example 3-17). Therefore, the choices for the field <se1-range> are <1-21> or <1-21>,<1-21>... or <1-21>-<1-21>. |
fac-id | Facility ID is the user-entered field that is used to easily identify a serial E1 interface. The facility ID is an alpha-numeric string that can be up to 64 characters long. |
framing | Type of framing being used for the serial E1 interface. Framing is either CEPT or unframed, when no framing is needed. If CRC is required, use cept-crc4 otherwise cept-no-crc. |
fm-rept | Fault monitoring reporting setting. Select on if all fault conditions on the serial E1 should be reported (that is, alarms should be declared). Select off if all fault conditions on the serial E1 should not be reported. Default setting is on. |
almpfl | Index of the alarm profile that should be used for this serial E1. The choices are 1, 2, 3, 4 (which are user-pecified alarm profiles), std and not-reported (that is, all the alarms have severity set to Not Reported [NR]). |
tca-rept | Threshold Crossing Alert (TCA) reporting flag. Select on if all TCAs on the serial E1 should be reported. Select off if all threshold crossing alerts on the serial E1 should not be reported. Default setting is on. |
gos | Index of the Grade of Service (GOS) profile to be used for this serial E1. The GOS profile contains the thresholds for threshold crossing alerts (TCAs). The choice for gos is currently only 1. |
delay | Auto delay time. The auto delay time allows operators to inhibit TCA reporting and fm reporting (that is alarm declaration) on the serial E1 up to a specified date and time. This feature is useful when the remote end or intermediate facilities have a known outage time or while troubleshooting the network. It is also useful while setting up new facilities when the remote end has not yet been set up. The maximum auto delay time is 90 days. The date parameter has to be entered in the mm/dd/yyyy format and the time parameter has to be entered in the hh:mm format. Default value is 00/00/0000 00:00. |
trig | Auto trigger time. The auto trigger timer allows operators to set a trigger timer that can last for up to 23:59 hours. The time parameter which is in the hh:mm format indicates the time for which the E1 has to be continuously functional before threshold crossing alert (TCA) reporting and fm reporting are activated. The auto trigger timer is set for the specified value when the serial E1 comes up. If the serial E1 goes down before the auto trigger timer is triggered, the auto trigger timer is rest to the specified value. When the auto trigger timer is triggered, TCA reporting and fm reporting are activated (if tca-rept and fm-rept are set to on) and the configuration value of trig is changed to zero. This feature is useful when the facility is known to have some irregularities in the early part of its being up. Default value is 00:00. |
admin | Administrative state. Select is to place the serial E1 in service. Select oos to place the serial E1 out of service. |
timing | Transmit timing mode. Select loop when the transmit timing for the serial E1 is obtained from the received clock. Select system when the transmit timing for the serial E1 is derived from the system clock. |
ts16 | Indicates whether timeslot 16 should be used either for data or Idle/signaling purposes. |
(config)#ine edit seriale1 se1-range
[fac-id string]
[framing {cept-no-crc | cept-crc4 |unframed}]
[fm-rept {on | off}]
[almpfl profile-number]
[tca-rept {on | off}]
[gos 1]
[delay date time]
[trig time]
[admin {is | oos}]
[timing {loop | system}]
[ts16 {data |idle}]
Look under ine enter seriale1 for explanations for the above parameters.
#show ine seriale1 1 SERIALE1 CONFIGURATION INFORMATION - SERIALE1 1 Facility Id: NONE Framing: CEPT-NO-CRC4 TS-16: DATA Fault Reporting: ON TCA Reporting: ON GOS Profile Index: 1 Alarm Profile Index: STANDARD Auto Delay Time: 0/0/0 0:00 Auto Trigger Time: 0:00 Administrative State: IN SERVICE Loopback Type: NONE Timing Mode: SYSTEM Loopback Allowed: ON SERIALE1 REAL-TIME STATUS INFORMATION - SERIALE1 1 Service State: IS_ANR_FLT Failure Type: AIS Current Fault Reporting: ON Current TCA Reporting: ON Trigger Timer Count Down Value: 0:00:00 BER Exponent: 0 Generate Test Pattern: OFF Measure Test Pattern: OFF
Posted: Thu Feb 24 12:26:05 PST 2000
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