Re: ISIS questions

Experts,
regarding point 4) I have modified the route-map based on Rich
suggestion but still no luck; I have enabled ISIS debugging and it
really looks like ISIS has no intention of redistributing 0/0.

*Apr 20 09:28:52.254: ISIS-RR: 0.0.0.0/0: Up event, from 0x61EF5338
*Apr 20 09:28:52.254: ISIS-RR: looking at L1 redist RIB
*Apr 20 09:28:52.254: ISIS-RR: not redistributed to ISIS

pe1#show ip route 0.0.0.0 0.0.0.0
Routing entry for 0.0.0.0/0, supernet
  Known via "static", distance 1, metric 0 (connected), candidate
default path
  Routing Descriptor Blocks:
  * directly connected, via Null0
      Route metric is 0, traffic share count is 1

router isis A1
 net 49.0001.0000.0000.0002.00
 is-type level-1
 metric-style wide
 redistribute bgp 1 metric 2 level-1
 passive-interface Loopback0
 default-information originate route-map LUCA

 route-map LUCA permit 10
 set level level-1

On Sun, 2010-04-11 at 21:42 +0200, Bit Gossip wrote:
> Experts,
> 1) if ISIS on ethernet interfaces uses 802.2 LLC encapsulation
> (DSAP=SSAP=0xFE), it means that it has length field in the header so it
> can not put on the wire frames longer than 1535 bytes. This means that
> even if I can have big MTU on the inteface, ISIS can only use the max
> allowed by 802.2 which is roughly ~1500 bytes and then fragment the
> LSP ?
>
> 2) if I configure 'metric-style transition' both narrow and wide metrics
> are used in parallel, but which one will determine the route selection
> in case they are in disagreement?
>
> 3) are TLVs 128 and 130 still advertised if I configure wide metric only
> and therefore I use TLV 135?
>
> 4) according to :
> http://www.cisco.com/en/US/partner/docs/ios/12_2t/ip_route/command/reference/p2ftisis.html#wp1057284
> The command 'default-information originate [route-map map-name]' without
> a route map, the default is advertised only in Level 2 LSPs.
> I want a L1 only router to advertise the 0/0 in its area but no luck;
> this is the config but no default is advertised .....
>
> pe1#show running-config | b ^router isis
> router isis A1
> net 49.0001.0000.0000.0002.00
> is-type level-1
> passive-interface Loopback0
> default-information originate route-map LUCA
> !
> ip route 0.0.0.0 0.0.0.0 Null0
> !
> access-list 1 permit 1.0.0.2
> !
> route-map LUCA permit 10
> match ip address 1
>
> pe1#show ip route
> <...>
> Gateway of last resort is 0.0.0.0 to network 0.0.0.0
> <...>
> <...>
> S* 0.0.0.0/0 is directly connected, Null0
>
>
> Thanks,
> Bit.

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Received on Tue Apr 20 2010 - 11:49:21 ART