[c-nsp] Inconsistent CLNS/IS-IS routes

[Vincent DE KEYZER]

Hello all,

I'm back on c-nsp after several years of absence, convinced that I will get the usual good service...

We are currently troubleshooting an old, badly-documented, non-supported, CLNS/IS-IS network (for management of Alcatel NEs).

One of the issues we have identified is IS-IS routes not being announced by one router to another (this might or might not explain the overall problem of no connectivity, but let's go step by step).

The two routers are ALGiers and ORAn, directly connected with a serial E1 link.

The adjacency looks good to me. Algiers correctly sees Oran (and has a CLNS neighborship via the server we are interested in):

     ALG2-R26-01#sh clns ne

     System Id      Interface   SNPA                State  Holdtime  Type Protocol
     0007.729E.FFEE Et0/1       0007.729e.ffee      Up     92        L1   IS-IS
     0007.72A2.FEA6 Et0/1       0007.72a2.fea6      Up     91        L1   IS-IS
     0020.602B.CBB4 Et0/1       0020.602b.cbb4      Up     95        L1   IS-IS
     0020.6013.2DD2 Et0/1       0020.604a.972e      Up     92        L1   IS-IS
-->  0030.6E4B.455C Et0/1       0011.85c7.3ec0      Up     97        L1   IS-IS  <----- Server
     0030.6E4B.47DB Et0/1       0012.799d.51a6      Up     95        L1   IS-IS
     rtrnoc01       Et0/1       0014.1ce6.60fd      Up     9         L1L2 IS-IS
     rtrann01       Se0/2       *PPP*               Up     24        L1L2 IS-IS
-->  rtrora01       Se0/3       *PPP*               Up     26        L1L2 IS-IS  <----- Oran router
     1880.F524.8FF0 Et0/1       1880.f52d.958e      Init   48        L1   IS-IS
     ALG2-R26-01#

Oran sees Algiers:

     ORA1-R26-01#sh clns ne

     System Id      Interface   SNPA                State  Holdtime  Type Protocol
     0020.6013.37F2 Fa0/1       0020.6013.37f2      Up     96        L1   IS-IS
-->  rtrnal01       Se0/1/1:0   *PPP*               Up     24        L1L2 IS-IS  <----- Algiers router
     rtralg01       Se0/1/0:0   *PPP*               Up     28        L1L2 IS-IS
     0020.602B.CF8A Fa0/1       0020.602b.cf8a      Up     46        L1   IS-IS
     0080.9F20.0931 Fa0/1       0080.9f20.03a3      Up     93        L1   IS-IS
     ORA1-R26-01#

But Oran does not seem receive from Algiers any of its 6 CLNS neighbors (and that includes the server):

     ORA1-R26-01#sh isis route | i 455C
     ORA1-R26-01#

You can see that the CLNS names are not consistent with the hostnames, but CDP does confirm the situation

     ALG2-R26-01#sh cdp ne

     Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID
     ORA1-R26-01         Ser 0/3        163         R S I      Cisco 2801Ser 0/1/1:0
     (...)

All seven routers in the network have already been rebooted.

Any idea why this inconsistency, or on how to troubleshoot further?

Thanks,

Vincent

[WIS Logo]

Vincent DE KEYZER - Provisioning & Support Manager
WIS TELECOM

[WIS BAND]<http://www.wis-telecom.com>
Rue du Commerce, 23
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vdekeyzer at wis-telecom.com<mailto:vdekeyzer at wis-telecom.com>                     T +32 67 740 826
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M +32 493 511 052
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