[f-nsp] MLXe BGP Next Hop Not Reachable

[Michael Gehrmann]

Two things I have found that may help you:
- next-hop unreachable can also mean filtered i.e. route-map problem
- next-hop-recursion can be your friend

Mike

On 30 August 2016 at 22:10, James Cornman <james at atlanticmetro.net> wrote:

> Hello,
>
> Came across a strange issue that I could use a second set of eyes on.
>
> Have an MLXe8 router with 5.6e running.  Customer BGP session is up and
> we're receiving the route they're advertising, but BGP thinks the next-hop
> is unreachable and not accepting the route. Its not even getting to the
> point of processing any prefix-lists or route-maps.
>
>
> SSH at router#show ip bgp neigh 10.60.154.210 received-routes detail
>        There are 1 received routes from neighbor 10.60.154.210
> Searching for matching routes, use ^C to quit...
> Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
>        E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH
> m:NOT-INSTALLED-MULTIPATH
>        S:SUPPRESSED F:FILTERED s:STALE
> 1       Prefix: 10.60.158.0/26,  Status: EF,  Age: 0h0m12s
>          NEXT_HOP: 10.60.154.210, Not Reachable, Learned from Peer:
> 10.60.154.210 (64585)
>           LOCAL_PREF: 100,  MED: 0,  ORIGIN: igp,  Weight: 0
>          AS_PATH: 64585
>
>
> interface ve 170
>  ip address 10.60.154.209/29
> !
>
>  neighbor CUSTOMER-ABC peer-group
>  neighbor CUSTOMER-ABC remote-as 64585
>  neighbor CUSTOMER-ABC soft-reconfiguration inbound
>  neighbor CUSTOMER-ABC default-originate
>  neighbor CUSTOMER-ABC route-map in CUSTOMER-NOEXPORT-in
>  neighbor CUSTOMER-ABC route-map out DEFAULT-ONLY
>  neighbor 10.60.154.210 peer-group CUSTOMER-ABC
>
> Tried the usual suspects of removing the interconnect /29 from the ve and
> re-applying, rebuilding the BGP session, bouncing it many times, etc.
> Session is up..ping communication works fine.
>
>
>
> --
>
> *James Cornman*
>
> jcornman at atlanticmetro.net
> 212.792.9950 - ext 101
>
> *Atlantic Metro Communications*
>
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-- 
Michael Gehrmann
Senior Network Engineer - Atlassian
m: +61 407 570 658
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