From: Bob Sinclair (bsinclair@netmasterclass.net)
Date: Tue Feb 17 2004 - 12:32:49 GMT-3
Edgar,
ISIS routers on a broadcast network must form a full-mesh of adjacencies.
This is not possible with a hub-and-spoke frame-relay topology, because the
multicasts used to form the adjacencies have a ttl of 1 (do not get
forwarded by the hub).
This is unlike OSPF, where the spokes only need to be adjacent with the DR,
which can be located at the hub.
One solution, of course, would be a full-mesh of PVCs. Another would be a
full mesh of tunnels. Another might be a hub with just 2 spokes, where the
hub does a level-1 adjacency with one spoke and a level-2 adjacency with the
other.
HTH,
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net
----- Original Message -----
From: "edgar feliz" <ejfeliz65@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, February 17, 2004 10:10 AM
Subject: ISIS on F/R NBMA
> Has anyone gotten ISIS to work over Frame-Relay configured on the main
interface with map statements. here is the hub router config. I have three
spokes my looback are seen by the hub router but the spokes don't see the
loopbacks of the other spokes only the hubs.
>
> I should see 192.168.1.1 and 192.168.2.2 on the sh ip route of router r4
but as you'll see below it is not working.
>
> interface Serial0/0
> ip address 150.50.100.3 255.255.255.248
> ip router isis
> ip pim nbma-mode
> ip pim sparse-mode
> encapsulation frame-relay
> ip igmp join-group 224.0.1.40
> no fair-queue
> clockrate 256000
> isis priority 127
> frame-relay map clns 402 broadcast
> frame-relay map clns 406 broadcast
> frame-relay map clns 403 broadcast
> frame-relay map ip 150.50.100.1 402 broadcast
> frame-relay map ip 150.50.100.2 403 broadcast
> frame-relay map ip 150.50.100.4 406 broadcast
> frame-relay lmi-type cisco
>
>
> Sh ip route os one spoke..................................
> 117.0.0.0/24 is subnetted, 1 subnets
> S 117.17.17.0 is directly connected, Null0
> 116.0.0.0/24 is subnetted, 1 subnets
> S 116.16.16.0 is directly connected, Null0
> 172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
> i L1 172.16.136.0/26 [115/20] via 150.50.100.3, Serial0/0
> i L1 172.16.35.0/30 [115/20] via 150.50.100.3, Serial0/0
> 192.168.4.0/32 is subnetted, 1 subnets
> C 192.168.4.4 is directly connected, Loopback0
> 192.168.5.0/32 is subnetted, 1 subnets
> i L1 192.168.5.5 [115/30] via 150.50.100.3, Serial0/0
> 13.0.0.0/24 is subnetted, 1 subnets
> B 13.13.13.0 [200/0] via 192.168.3.3, 00:10:12
> 14.0.0.0/24 is subnetted, 1 subnets
> B 14.14.14.0 [200/0] via 192.168.3.3, 00:10:13
> 150.50.0.0/29 is subnetted, 1 subnets
> C 150.50.100.0 is directly connected, Serial0/0
> 192.168.3.0/32 is subnetted, 1 subnets
> i L1 192.168.3.3 [115/20] via 150.50.100.3, Serial0/0
> r43620#
>
>
> Thanks Edgar
>
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