From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> on behalf of sreejith n via
lists.fd.io <sreejithsurendrannair2=gmail....@lists.fd.io>
Date: Thursday, 25 August 2022 at 13:10
To: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io>
Subject: [vpp-dev] Query regarding neos mpls fib entry for tunnel interface
Hi All,
I have a query regarding neos mpls fib entry for tunnel interface. I have
observed when we create mpls fib entry with neos bit set for tunnel label it
always sets forwarding as drop ("dpo-drop mpls"). For the eos bit the issue is
not seen the forwarding is set correctly.
Is this expected to have neos mpls fib entry created as drop for mpls tunnel
interface. Is this due to any reason. I am checking on a use case in which I
have to set the tunnel label with both neos and eos fib bit entry for the
lookup and forwarding .
Logs:
CLI:
"mpls local-label add 51999 via l2-input-on mpls-tunnel0"
You are adding the local-label entry to point to l2-input, that is, after
popping the label consider what remains to be an ethernet frame and pretend
that it arrived on mpls-tunnel0. That works when the label popped is
end-of-stack, but not when it’s not end-of-stack. Hence the neos entry is a
drop.
/neale
MPLS FIB:
51999:neos/21 fib:0 index:35 locks:2
CLI refs:1 entry-flags:attached, src-flags:added,contributing,active,
path-list:[30] locks:4 flags:shared, uPRF-list:27 len:0 itfs:[]
path:[34] pl-index:30 ethernet weight=1 pref=0 intf-rx:
oper-flags:resolved, cfg-flags:interface-rx,
[@0]: mpls-tunnel0-rx-dpo: ethernet
forwarding: mpls-neos-chain >>>> NEOS
[@0]: dpo-load-balance: [proto:mpls index:40 buckets:1 uRPF:27 to:[0:0]]
[0] [@0]: dpo-drop mpls >>>> DROP
51999:eos/21 fib:0 index:24 locks:2
API refs:1 entry-flags:attached, src-flags:added,contributing,active,
path-list:[30] locks:4 flags:shared, uPRF-list:27 len:0 itfs:[]
path:[34] pl-index:30 ethernet weight=1 pref=0 intf-rx:
oper-flags:resolved, cfg-flags:interface-rx,
[@0]: mpls-tunnel0-rx-dpo: ethernet
forwarding: mpls-eos-chain >>>>>> EOS
[@0]: dpo-load-balance: [proto:mpls index:26 buckets:1 uRPF:27 to:[34:1700]]
[0] [@6]: mpls-tunnel0-rx-dpo: ethernet >>>> VALID
Thanks & Regards,
Sreejith
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