[SANOG] Issue with ISC F root IPv6 routing in Chennai

[Anurag Bhatia]

Hello,



Anyone here from NIXI or ISC?


I see there's a consistent issue with IPv6 for F root anycast instance in
Chennai hosted at NIXI - *2001:500:2f::f*



[image: Inline image 1]








If I trace it from the RIPE Atlas anchor, I get following:

Probe #6107

  1 2401:7500:fff0:1::1                      0.838 ms     0.747 ms
0.632 ms
  2 2400:5200:1c00:d::1                      1.755 ms     1.745 ms
1.726 ms
  3 2403:0:100::2be                          2.089 ms     2.054 ms
2.049 ms
  4 2404:a800:2a00::13d                     45.589 ms    26.274 ms
33.64 ms
  5 2404:a800::178                          26.376 ms    25.406 ms
 25.276 ms
  6 2001:de8:1:2::3                         25.363 ms    25.232 ms
 25.223 ms
  7 *                                               *            *
   *
  8 *                                               *            *
   *
  9 *                                               *            *
   *
 10 *                                               *            *
   *
 11 *                                               *            *
   *




6th hop is ISC's router on NIXI Chennai peering fabric
(2001:de8:1:2::/64).  Clearly, there's an issue in return path and possibly
setup is either without default or misconfigured IPv6 or partial table.






on "sh bgp ipv6 sum" on NIXI Chennai route server, it gives:

 2001:de8:1:2::3           24049       ESTAB   25d 3h10m     1           0
       2263     0
 2001:de8:1:2::4           24049       ESTAB   125d18h30m    1           0
       2264     0





show ipv6 bgp neighbors 2001:de8:1:2::3 received-routes
       There are 1 received routes from neighbor 2001:de8:1:2::3
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
       Prefix             Next Hop        MED        LocPrf     Weight
Status
1      2001:500:2f::/48   2001:de8:1:2::3 10         100        0      BE

         AS_PATH: 24049 3557


show ipv6 bgp neighbors 2001:de8:1:2::4 received-routes
       There are 1 received routes from neighbor 2001:de8:1:2::4
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
       Prefix             Next Hop        MED        LocPrf     Weight
Status
1      2001:500:2f::/48   2001:de8:1:2::4 10         100        0      E

         AS_PATH: 24049 3557






One should possible stop this BGP announcement until return path issue is
fixed.



Thanks.

-- 


Anurag Bhatia
anuragbhatia.com
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