troubleshooting an Aggregate Problem

From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Wed May 10 2006 - 21:04:04 ART


This command is very great to check your aggregates when troubleshooting an
Aggregate Problem (fat finger in the mask)

 

Rack1R1#show ip route 172.168.0.0

Routing entry for 172.168.0.0/16, 26 known subnets

  Variably subnetted with 2 masks

 

B 172.168.4.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.5.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.6.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.7.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.0.0/19 [200/0] via 0.0.0.0, 00:09:36, Null0

B 172.168.1.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.2.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.3.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.12.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.13.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.14.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.15.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.8.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.9.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.10.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.11.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.20.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.21.0/24 [200/0] via 10.6.6.6, 00:09:36

B 172.168.22.0/24 [200/0] via 10.6.6.6, 00:09:37

B 172.168.23.0/24 [200/0] via 10.6.6.6, 00:09:37

B 172.168.16.0/24 [200/0] via 10.6.6.6, 00:09:37

B 172.168.17.0/24 [200/0] via 10.6.6.6, 00:09:37

B 172.168.18.0/24 [200/0] via 10.6.6.6, 00:09:37

B 172.168.19.0/24 [200/0] via 10.6.6.6, 00:09:37

B 172.168.24.0/24 [200/0] via 10.6.6.6, 00:09:37

B 172.168.25.0/24 [200/0] via 10.6.6.6, 00:09:37

                                            

Rack1R1#

Rack1R1#show ip route 172.168.4.0 255.255.252.0 longer

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static
route

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     172.168.0.0/16 is variably subnetted, 26 subnets, 2 masks

B 172.168.4.0/24 [200/0] via 10.6.6.6, 00:10:08

B 172.168.5.0/24 [200/0] via 10.6.6.6, 00:10:08

B 172.168.6.0/24 [200/0] via 10.6.6.6, 00:10:08

B 172.168.7.0/24 [200/0] via 10.6.6.6, 00:10:08

Rack1R1#

Rack1R1#show ip route 172.168.4.0 255.255.254.0 longer

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static
route

       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     172.168.0.0/16 is variably subnetted, 26 subnets, 2 masks

B 172.168.4.0/24 [200/0] via 10.6.6.6, 00:11:53

B 172.168.5.0/24 [200/0] via 10.6.6.6, 00:11:53

 

CISCO VERY NICE!!!



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