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Can sbfd work with 2 segment lists under 1 path simultaneously.

markk2316
Level 1
Level 1

Hey !
I'm trying to establish an S-BFD session (seamless BFD) with an SR-TE policy that utilizes OSPF with a single path and 2 segment lists.

I have an SR-TE policy configured with 2 segment lists as follows

segment-routing
traffic-eng
policy SRTE_bla
source-address ipv4 66.110.0.63
color 50 end-point ipv4 33.33.33.33
autoroute
force-sr-include
!
bfd
minimum-interval 150
multiplier 3
invalidation-action none
!
candidate-paths
preference 1
explicit segment-list Mark_KK
!
explicit segment-list Mark_KK_1

Of course the tail end has been established as a reflector with matching discriminators.
My question comes when i examine the show of the policy. I noticed that only 1 lsp is chosen as the Active LSP and the sbfd sessions runs on it. If the active segment lists goes down the other segment lists kicks into action and begins sending SBFD traffic on the new path. My question is can i run SBFD traffic on both segment lists given the fact that they are both valid ?

Color: 50, End-point: 33.33.33.33
Name: srte_c_50_ep_33.33.33.33
Status:
Admin: up Operational: up for 20:45:01 (since Aug 1 16:43:34.230)
Candidate-paths:
Preference: 1 (configuration) (active)
Name: SRTE_bla
Requested BSID: dynamic
PCC info:
Symbolic name: cfg_SRTE_bla_discr_1
PLSP-ID: 440943
Constraints:
Protection Type: protected-preferred
Maximum SID Depth: 10
Explicit: segment-list Mark_KK_1 (valid)
Weight: 1, Metric Type: TE
SID[0]: 400686 [Prefix-SID, 33.33.33.33]
Explicit: segment-list Mark_KK (valid)
Weight: 1, Metric Type: TE
SID[0]: 400657 [Prefix-SID, 188.37.199.254]
LSPs:
LSP[0]:
LSP-ID: 158 policy ID: 23966 (active)
Local label: 44587
State: Programmed
Binding SID: 24074
BFD:
Session state: up, for 00:01:47 (since Aug 2 13:26:48.682)

 

1 Reply 1

Thank you for the reply and for your insight however i just noticed that i made a typo. 
I meant s-BFD (seamless BFD).

It is monitoring the liveliness of an SRTE head and tail. But i assume that there is a way to monitor more than 1 segment list such as in the purpose of ECMP