Dear friends,
A colleague has asked me to assist him with establishing a L2TP pseudowire between two 7600 series routers. At first I thought it to be an easy task but it unexpectedly turned into an issue we both could not solve.
The goal was to provide a plain L2TP pseudowire between two ports on different 7600 routers (no interworking, just a simple pseudowire). This pseudowire was configured in a straightforward way using a simple pseudowire-class and an xconnect command on the respective Ethernet interfaces:
pseudowire-class PW-Class
encapsulation l2tpv3
ip local interface Loopback0
!
interface GigabitEthernet3/0/0
no ip address
speed 1000
no mls qos trust
xconnect A.B.C.D 1234 encapsulation l2tpv3 pw-class PW-Class
The problem is that while the L2TP control connection is successfully established, this tunnel does not carry any data whatsoever:
7604-First# show l2tp
L2TP Tunnel and Session Information Total tunnels 1 sessions 1
LocTunID RemTunID Remote Name State Remote Address Sessn L2TP Class/
Count VPDN Group
2978780432 1598333693 7604-Second est A.B.C.D 1 l2tp_default_cl
LocID RemID TunID Username, Intf/ State Last Chg Uniq ID
Vcid, Circuit
9560 21227 2978780432 1234, Gi3/0/0 est 00:36:55 20
7604-First# show l2tp session packets
L2TP Session Information Total tunnels 1 sessions 1
LocID RemID TunID Pkts-In Pkts-Out Bytes-In Bytes-Out
9560 21227 2978780432 0 0 0 0
We have tried several ways of configuring the pseudowire, both by using the xconnect directly on the physical interface and by creating a "service instance" and using the xconnect inside the service instance configuration. Nothing had a positive effect. The L2TP control connection gets established readily but the frames received by the GI3/0/0 do not even seem to be forwarded into the pseudowire. The problem is identical on both ends of the pseudowire.
The question is - is there a problem in the configuration or does the 7600 with the ES20 line card lack the proper support for establishing L2TP pseudowires?
Information about the hardware equipment and software versions:
IOS Version: Cisco IOS Software, c7600rsp72043_rp Software (c7600rsp72043_rp-ADVIPSERVICESK9-M), Version 12.2(33)SRD4, RELEASE SOFTWARE (fc2)
Extract from "show inventory":
NAME: "CISCO7604", DESCR: "Cisco Systems Cisco 7600 4-slot Chassis System"
NAME: "CLK-7600 1", DESCR: "OSR-7600 Clock FRU 1"
NAME: "CLK-7600 2", DESCR: "OSR-7600 Clock FRU 2"
NAME: "module 1", DESCR: "RSP720-3C-GE 2 ports Route Switch Processor 720 Rev. 5.9"
NAME: "msfc sub-module of 1", DESCR: "7600-MSFC4 C7600 MSFC4 Daughterboard Rev. 1.5"
NAME: "switching engine sub-module of 1", DESCR: "7600-PFC3C Policy Feature Card 3 Rev. 1.2"
NAME: "module 3", DESCR: "7600-ES20-GE3C ESM20G Rev. 1.5"
NAME: "LINK sub-module of 3", DESCR: "7600-ES20-20GE Link Daugher Card Rev. 1.1"
NAME: "subslot 3/0 transceiver 0", DESCR: "GE T"
NAME: "subslot 3/0 transceiver 1", DESCR: "GE T"
NAME: "subslot 3/0 transceiver 2", DESCR: "GE T"
NAME: "subslot 3/0 transceiver 3", DESCR: "GE T"
NAME: "subslot 3/0 transceiver 4", DESCR: "GE T"
NAME: "subslot 3/0 transceiver 5", DESCR: "GE T"
NAME: "subslot 3/0 transceiver 18", DESCR: "GE T"
NAME: "subslot 3/0 transceiver 19", DESCR: "GE T"
NAME: "CPU sub-module of 3", DESCR: "7600-ES20-PROC FRU type (0x6005, 0x6A5(1701)) Rev. 1.4"
NAME: "switching engine sub-module of 3", DESCR: "7600-ES20-D3C ESM20G/PFC3C Distributed Forwarding Card Rev. 1.2"
NAME: "FAN-MOD-4HS 1", DESCR: "High Speed Fan Module for CISCO7604 1"
NAME: "PS 1 PWR-2700-AC/4", DESCR: "2700W AC power supply for CISCO7604 1"
NAME: "PS 2 PWR-2700-AC/4", DESCR: "2700W AC power supply for CISCO7604 2"
Any help or guidance is very much appreciated!
Best regards,
Peter
The layer 2-facing line card must be an L2TPv3-supporting line card.