[c-nsp] ASR9K to ASR920 MPLS issue

[Jerry Bacon]

I will check that out, but I think that as long as both ends are the 
same (both with rewrite, or both without) it will work correctly.

I did solve this problem, though I'm not sure exactly what the true 
nature of the issue really is. As you noted, everything looks right, but 
I can't get any actual traffic across the VC. Upgrading to 16.7.1, 
without any other changes, makes it work.

-- 

Jerry Bacon
Senior Network Engineer
StarTouch, Inc.
http://www.startouch.com
360-543-5679 ext. 111
Microwave - Fiber Optics - Internet Services

On 1/12/2021 9:02 AM, James Bensley wrote:
> 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.