CCNP TSHOOT 6.0 - The Cisco Learning Network

CCNPv6 TSHOOT
O 10.1.200.0/24 [110/2] via 10.1.2.1, 07:43:00, FastEthernet0/1
O 10.1.211.1/32 [110/2] via 10.1.2.1, 07:43:10, FastEthernet0/1
O 10.1.212.1/32 [110/3] via 10.1.2.1, 07:43:00, FastEthernet0/1
R1#show ip route 10.1.50.0 255.255.255.0
Routing entry for 10.1.50.0/24
Known via "ospf 1", distance 110, metric 2, type inter area
Redistributing via eigrp 1
Advertised by eigrp 1 metric 1544 2000 255 1 1500
Last update from 10.1.2.1 on FastEthernet0/1, 07:42:07 ago
Routing Descriptor Blocks:
* 10.1.2.1, from 10.1.211.1, 07:42:07 ago, via FastEthernet0/1
Route metric is 2, traffic share count is 1
The source of a route in the routing table is marked by the “from” field that follows the next-hop IP address. For
distance vector protocols, the source and next-hop addresses are typically the same. For a link-state protocol,
such as OSPF, this is the router that originated the LSA on which the route is based. By tracking the routing
source from router to router, you can determine the point where the incorrect routing information is injected into
the routing protocol’s data structures, and you can apply filtering to stop it from being propagated.
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