[c-nsp] ASR9K to ASR920 MPLS issue

[James Bensley]

On Wed, 6 Jan 2021 at 18:47, Jerry Bacon <jerryb at startouch.com> wrote:
>
> This is exactly what I started with, but it didn't work, which is why I
> tried some other things. I have reverted to this configuration.
>
> Can I omit the "rewrite ..." on both sides?

Why would you want to? I think that if you do that, a VLAN tagged
frame coming into one end with VLAN 95, will be send over the
pseudoiwre with the VLAN tag still present, at the other end it will
have VLAN 95 push on egress, so it will leave the other end double
tagged with an inner and outer VLAN tag of 95.

> Here's the status on both sides:
>
> RP/0/RSP0/CPU0:startouch-9k-1#show l2vpn xconnect pw-id 95 detail
> Wed Jan  6 10:39:49.276 PST
>
> Group mpls1, XC test1, state is up; Interworking none
>    AC: TenGigE0/0/1/0.95, state is up
>      Type VLAN; Num Ranges: 1
>      Rewrite Tags: []
>      VLAN ranges: [95, 95]
>      MTU 9100; XC ID 0x1200014; interworking none
>      Statistics:
>        packets: received 811907, sent 28
>        bytes: received 55209904, sent 2166
>        drops: illegal VLAN 0, illegal length 0
>    PW: neighbor 10.100.66.1, PW ID 95, state is up ( established )
>      PW class not set, XC ID 0xa0000003
>      Encapsulation MPLS, protocol LDP
>      Source address 10.100.25.11
>      PW type Ethernet, control word disabled, interworking none
>      PW backup disable delay 0 sec
>      Sequencing not set
>      LSP : Up
>
>      PW Status TLV in use
>        MPLS         Local                          Remote
>        ------------ ------------------------------
> -----------------------------
>        Label        83377                          165
>        Group ID     0x40001c0                      0x1f
>        Interface    TenGigE0/0/1/0.95              test1
>        MTU          9100                           9100
>        Control word disabled                       disabled
>        PW type      Ethernet                       Ethernet
>        VCCV CV type 0x2                            0x2
>                     (LSP ping verification)        (LSP ping verification)
>        VCCV CC type 0x6                            0x2
>                     (router alert label)           (router alert label)
>                     (TTL expiry)
>        ------------ ------------------------------
> -----------------------------
>      Incoming Status (PW Status TLV):
>        Status code: 0x0 (Up) in Notification message
>      Outgoing Status (PW Status TLV):
>        Status code: 0x0 (Up) in Notification message
>      MIB cpwVcIndex: 2684354563
>      Create time: 06/01/2021 10:27:29 (00:12:20 ago)
>      Last time status changed: 06/01/2021 10:27:45 (00:12:04 ago)
>      Statistics:
>        packets: received 28, sent 811907
>        bytes: received 2166, sent 55209904
>
> startouch-asr920-rtr#show mpls l2t vc 95 det
> Local interface: Te0/0/25 up, line protocol up, Eth VLAN 95 up
>    Interworking type is Ethernet
>    Destination address: 10.100.25.11, VC ID: 95, VC status: up
>      Output interface: BD3268, imposed label stack {83377}
>      Preferred path: not configured
>      Default path: active
>      Next hop: 10.100.66.74
>    Create time: 00:16:26, last status change time: 00:14:35
>      Last label FSM state change time: 00:14:45
>      Last peer autosense occurred at: 00:14:45
>    Signaling protocol: LDP, peer 10.100.25.11:0 up
>      Targeted Hello: 10.100.66.1(LDP Id) -> 10.100.25.11, LDP is UP
>      Graceful restart: configured and not enabled
>      Non stop routing: not configured and not enabled
>      Status TLV support (local/remote)   : enabled/supported
>        LDP route watch                   : enabled
>        Label/status state machine        : established, LruRru
>        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: No fault
>        Last local PW i/f circ status rcvd: No fault
>        Last local LDP TLV     status sent: No fault
>        Last remote LDP TLV    status rcvd: No fault
>        Last remote LDP ADJ    status rcvd: No fault
>      MPLS VC labels: local 165, remote 83377
>      Group ID: local 31, remote 67109312
>      MTU: local 9100, remote 9100
>      Remote interface description: TenGigE0_0_1_0.95
>    Sequencing: receive disabled, send disabled
>    Control Word: Off (configured: autosense)
>    SSO Descriptor: 10.100.25.11/95, local label: 165
>    Dataplane:
>      SSM segment/switch IDs: 90237/65659 (used), PWID: 24
>    VC statistics:
>      transit packet totals: receive 442, send 1
>      transit byte totals:   receive 31804, send 90
>      transit packet drops:  receive 0, seq error 0, send 0

^ everything looks fine here. Is this still not working? If not, did
you have it configured with the "rewrite" statement?

Cheers,
James.