[c-nsp] (BGP) BFD on XR in vrf on sub-interface of bundle-ether interface

[David Hubbard]

What platform are you on?  I ran into numerous issues with XR + BFD on NCS5501-SE hardware; worked with TAC and confirmed.  It's broken for bundle interfaces (gives an error, won't take the config), broken for BGP (takes the config without error but doesn't work), and broken if VRRP is in use.  It will only work on a single physical link on that platform.  We swapped out for Arista 7280's ultimately.



On 6/28/19, 1:19 PM, "cisco-nsp on behalf of christoffer at netravnen.de" <cisco-nsp-bounces at puck.nether.net on behalf of christoffer at netravnen.de> wrote:

    c-nsp,
    
    Anyone having tried running (BGP) BFD on XR in vrf on sub-interface of
    bundle-ether interface with success? Have tried looking through
    documentation at Cisco.com with no luck so far.
    
    Currently trying to get a session up with an non-cisco device on the
    other end. No avail. Luck is close to up.
    Have tried reading the Cisco Documentation from 4.2 release concerning
    the restrictions to BFD mentioned. But I cannot get around to be wiser
    if the restrictions applies to the below mentioned situation or not. :???:
    
    
    
    [Cisco XR <=> Cisco SW (L2) <=> Juniper SW (L2) <=> Arista SW (L3)]
    [   \            /    \             /        \           /        ]
    [   trunk    trunk    trunk      trunk     access    access       ]
    [     \        /        \         /            \       /          ]
    [     #Vlan tagged#     #Vlan tagged#          #untagged#         ]
    
    BFD is tried configured between XR and Arista SW.
    
      * Cisco XR <=> Cisco SW (L2) : trunk interface (LAG group)
      * Cisco SW (L2) <=> Juniper SW (L2) : trunk interface
      * Juniper SW (L2) <=> Arista SW (L3) : access interface
    
      § same Vlan tag is carried on traffic between Cisco XR <=> Juniper SW.
        Juniper SW pops vlan tag before forwarding traffic to Arista SW.
    
    Using "monitor traffic interface(...)matching "udp && (port 49152 ||
    port 3784)" looking for traversing BFD packets on Juniper SW (L2)...
    Returns an empty output. No packet(s) matched.
    
    
    
    Configuration Example Snippet from XR:
    
    bfd
     interface Bundle-Ether500.600
      no echo
     !
    !
    interface Bundle-Ether500.600
     vrf RED
     ipv4 mtu 1500
     ipv4 address 10.10.10.9 255.255.255.252
     encapsulation dot1q 600
    !
    router bgp 65000
     vrf RED
      neighbor 10.10.10.10
       remote-as 65001
       bfd fast-detect
       bfd multiplier 3
       bfd minimum-interval 3000
      !
     !
    !
    interface Bundle-Ether500
     mtu 9000
     bundle minimum-active links 1
    !
    interface Te0/0/0/0
     bundle id 500 mode active
    !
    interface Te0/0/1/3
     bundle id 500 mode active
    !
    
    
    RP/0/RSP1/CPU0:XR#sh conf run int Bundle-Ether500.600
    I/f: Bundle-Ether500.600, Location: 0/RSP1/CPU0
    Dest: 10.10.10.10
    Src: 10.10.10.9
     State: DOWN for 0d:1h:0m:0s, number of times UP: 0
     Session type: SW/V4/SH/BL
    Received parameters:
     Version: 0, desired tx interval: 0 ms, required rx interval: 0 ms
     Required echo rx interval: 0 ms, multiplier: 0, diag: None
     My discr: 0, your discr: 0, H/D/F/P/C/A: 0/0/0/0/0/0
    Transmitted parameters:
     Version: 0, desired tx interval: 0 ms, required rx interval: 0 ms
     Required echo rx interval: 0 ms, multiplier: 0, diag: None
     My discr: 0, your discr: 0, H/D/F/P/C/A: 0/0/0/0/0/0
    Timer Values:
     Local negotiated async tx interval: 0 ms
     Remote negotiated async tx interval: 0 s
     Desired echo tx interval: 0 s, local negotiated echo tx interval: 0 ms
     Echo detection time: 0 ms, async detection time: 0 ms
    Label:
     Internal label: 289033/0x46909
    Local Stats:
     Intervals between async packets:
       Tx: Number of intervals=0, min=0 s, max=0 s, avg=0 s
           Last packet transmitted 0 s ago
       Rx: Number of intervals=0, min=0 s, max=0 s, avg=0 s
           Last packet received 0 s ago
     Intervals between echo packets:
       Tx: Number of intervals=0, min=0 s, max=0 s, avg=0 s
           Last packet transmitted 0 s ago
       Rx: Number of intervals=0, min=0 s, max=0 s, avg=0 s
           Last packet received 0 s ago
     Latency of echo packets (time between tx and rx):
       Number of packets: 0, min=0 ms, max=0 ms, avg=0 ms
    MP download state: BFD_MP_DOWNLOAD_NO_LC
    State change time: Jun 28 14:14:14.147
    Session owner information:
                                Desired               Adjusted
      Client               Interval   Multiplier Interval   Multiplier
      -------------------- --------------------- ---------------------
      bgp-default          3 s        3          3 s        3
    
    
    RP/0/RSP1/CPU0:XR#sh ver | i Cisco IOS XR Software
    Cisco IOS XR Software, Version 5.3.4[Default]
    
    
    RP/0/RSP1/CPU0:XR#show bfd counters packet
    	---empty_output---
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