interesting troubleshooting

Sun Mar 22 09:26:19 UTC 2020

Hey Tassos,

On Sat, 21 Mar 2020 at 22:51, Tassos Chatzithomaoglou
<achatz at forthnet.gr> wrote:

> Yep, the RFC gives this option.
> Does Juniper MX/ACX series support it?
> I know for sure Cisco doesn't.

I only run bidir, which Cisco do you mean? ASR9k allows you to configure it.

  both      Insert/Discard Flow label on transmit/recceive
  code      Flow label TLV code
  receive   Discard Flow label on receive
  transmit  Insert Flow label on transmit

JunOS as well:

  flow-label-receive   Advertise capability to pop Flow Label in
receive direction to remote PE
  flow-label-receive-static  Pop Flow Label from PW packets received
from remote PE
  flow-label-transmit  Advertise capability to push Flow Label in
transmit direction to remote PE
  flow-label-transmit-static  Push Flow Label on PW packets sent to remote PE

RP/0/RP0/CPU0:r14.labxtx01.us.(config-l2vpn-pwc-mpls)#do show l2vpn
xconnect interface Te0/2/0/3/7.1000 detail
..

  PW: neighbor 204.42.110.29, PW ID 1290, state is up ( established )
    PW class ethernet-ccc, XC ID 0xa0000025
    Encapsulation MPLS, protocol LDP
    Source address 204.42.110.15
    PW type Ethernet, control word disabled, interworking none
    PW backup disable delay 0 sec
    Sequencing not set
    LSP : Up
    Load Balance Hashing: src-dst-ip
    Flow Label flags configured (Tx=1,Rx=0), negotiated (Tx=1,Rx=0)
....

ytti at r28.labxtx01.us.bb# run show l2circuit connections interface et-0/0/54:3.0
...
Neighbor: 204.42.110.15
    Interface                 Type  St     Time last up          # Up trans
    et-0/0/54:3.0(vc 1290)    rmt   Up     Mar 20 04:06:45 2020           7
      Remote PE: 204.42.110.15, Negotiated control-word: No
      Incoming label: 585, Outgoing label: 24003
      Negotiated PW status TLV: No
      Local interface: et-0/0/54:3.0, Status: Up, Encapsulation: ETHERNET
        Description: BD: wmccall ixia 1-1
      Flow Label Transmit: No, Flow Label Receive: Yes
...

I didn't push bits, but at least I can signal unidir between ASR9k and PTX1k.

-- 
  ++ytti