[c-nsp] ASR9k to Me3600x VPLS

Pshem Kowalczyk pshem.k at gmail.com
Sun Mar 10 18:12:12 EDT 2013


Hi,

The discovery works fine - we have the prefix length specified on the
Me3600x,  both devices know that they have to build the LSP it's just
not coming up and I think it's not coming up because the control word
can not be negotiated properly.

kind regards
Pshem


On 11 March 2013 10:38, Adam Vitkovsky <adam.vitkovsky at swan.sk> wrote:
> 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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