[c-nsp] ASR9k to Me3600x VPLS

Adam Vitkovsky adam.vitkovsky at swan.sk
Sun Mar 10 17:38:58 EDT 2013


Hi Pshem,
Isn't the "prefix-length-size 2" the problem?

>From Cisco web page:

Interoperability Between Cisco IOS XR and Cisco IOS on VPLS LDP Signaling

The Cisco IOS Software encodes the NLRI length in the fist byte in bits
format in the BGP Update message. However, the Cisco IOS XR Software
interprets the NLRI length in 2 bytes. Therefore, when the BGP neighbor with
VPLS-VPWS address family is configured between the IOS and the IOS XR, NLRI
mismatch can happen, leading to flapping between neighbors. To avoid this
conflict, IOS supports prefix-length-size 2 command that needs to be enabled
for IOS to work with IOS XR. When the prefix-length-size 2 command is
configured in IOS, the NLRI length is encoded in bytes. This configuration
is mandatory for IOS to work with IOS XR.

This is a sample IOS configuration with the prefix-length-size 2 command:

router bgp 1
 address-family l2vpn vpls
  neighbor 5.5.5.2 activate
  neighbor 5.5.5.2 prefix-length-size 2 --------> NLRI length = 2 bytes
 exit-address-family


adam

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Pshem Kowalczyk
Sent: Sunday, March 10, 2013 10:03 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] ASR9k to Me3600x VPLS

Hi,

I hope that collective knowledge can help me here.
We're trying to build a simple VPLS between an ASR9k (IOS XR 4.2.3) and
ME3600x (IOS 15.3(1)S) using BGP autodiscovery and LDP for signaling.

THe VPLS is not coming up,as the pseudowires are not up, I've located the
issue to the control word - the 9k runs with 'disabled' whilst the ME3600x
runs on autosense and that is failing as it results on 'control word on':

ME3600X:

Local interface: VFI VFI-1-20H731 vfi up
  Interworking type is Ethernet
  Destination address: 10.123.110.1, VC ID: 2105, VC status: down
    Last error: Local peer access circuit is down
    Output interface: none, imposed label stack {}
    Preferred path: not configured
    Default path: no route
    No adjacency
  Create time: 16:02:58, last status change time: 12w2d
    Last label FSM state change time: 16:02:58
  Signaling protocol: LDP, peer 10.123.110.1:0 up
    Targeted Hello: 10.123.143.1(LDP Id) -> 10.123.110.1, LDP is DOWN, no
binding
    Status TLV support (local/remote)   : enabled/None (no remote binding)
      LDP route watch                   : enabled
      Label/status state machine        : local ready, LruRnd
      Last local dataplane   status rcvd: No fault
      Last BFD dataplane     status rcvd: Not sent
      Last BFD peer monitor  status rcvd: No fault
      Last local AC  circuit status rcvd: No fault
      Last local AC  circuit status sent: Not sent
      Last local PW i/f circ status rcvd: No fault
      Last local LDP TLV     status sent: No fault
      Last remote LDP TLV    status rcvd: None (no remote binding)
      Last remote LDP ADJ    status rcvd: None (no remote binding)
    MPLS VC labels: local 212, remote unassigned
    AGI: type 1, len 8, 000A 4454 0000 0839
    Local AII: type 1, len 4, 0A7B 8F01 (10.123.143.1)
    Remote AII: type 1, len 4, 0A7B 6E01 (10.123.110.1)
    Group ID: local n/a, remote unknown
    MTU: local 9000, remote unknown
    Remote interface description:
  Sequencing: receive disabled, send disabled
  Control Word: On (configured: autosense)  <=========================
  Dataplane:
    SSM segment/switch IDs: 0/0 (used), PWID: 31
  VC statistics:
    transit packet totals: receive 0, send 0
    transit byte totals:   receive 0, send 0

ASR9k:

(sh l2vpn bridge-domain)

  List of VFIs:
    VFI VFI-1-20H731 (up)
      VPN-ID: 2105, Auto Discovery: BGP, state is Provisioned (Service
Connected)
      Route Distinguisher:  17492:10012105
      Import Route Targets:
        17492:2105
      Export Route Targets:
        17492:2105
      Signaling protocol: LDP
      AS Number: 17492
      VPLS-ID: 17492:2105
      L2VPN Router ID: 10.123.110.1
      PW: neighbor 10.123.143.1, PW ID 17492:2105, state is down ( all ready
) (Segment-down)
        PW class not set, XC ID 0xc000001e
        Encapsulation MPLS, Auto-discovered (BGP), protocol LDP
        Source address 10.123.110.1
        PW type Ethernet, control word disabled, interworking none
        PW backup disable delay 0 sec

        Sequencing not set

        PW Status TLV in use
          MPLS         Local                          Remote
          ------------ ------------------------------
-------------------------
          Label        16015                          212
          BGP Peer ID  10.123.110.1                   10.123.143.1
          LDP ID       10.123.110.1                   10.123.143.1
          AII          10.123.110.1                   10.123.143.1
          AGI          17492:2105                     17492:2105
          Group ID     0x5                            0x0
          Interface    VFI-1-20H731             unknown
          MTU          9000                           9000
          Control word disabled                       enabled
          PW type      Ethernet                       Ethernet
          VCCV CV type 0x2                            0x12
                       (LSP ping verification)        (LSP ping
verification)
          VCCV CC type 0x6                            0x3
                                                      (control word)
                       (router alert label)           (router alert label)
                       (TTL expiry)
          ------------ ------------------------------
-------------------------
        Incoming Status (PW Status TLV):
          Status code: 0x0 (Up) in Notification message
        MIB cpwVcIndex: 3221225502
        Create time: 07/03/2013 17:19:14 (16:04:16 ago)
        Last time status changed: 07/03/2013 17:19:30 (16:03:59 ago)
        MAC withdraw message: send 0 receive 0
        Error: illegal control word    <======================
        Static MAC addresses:
      DHCPv4 snooping: disabled
      IGMP Snooping profile: none
      VFI Statistics:
        drops: illegal VLAN 0, illegal length 0


Does anyone have it going between the 9k and ME3600x?

kind regards
Pshem
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