From: Gustavo Novais (gustavo.novais@novabase.pt)
Date: Sat Nov 19 2005 - 14:25:46 GMT-3
Hello
Doing some tests with how routes are summarized on OSPF
I have 4 external routes that I wish to aggregate. I redistribute into
OSPF, changing their metric-type (some are E1, some are E2)
When I do summary address, which will be the route-type of this
aggregate?
I was not able to reach a definitive answer to this, because when I
marked 2 routes E1 and two routes E2, the summary was a E1, and if I did
1 route E1 and three routes E2, the summary will be E2?
I will post my tests (I'm doing load balancing, but nevermind that):
2 routes E1 and 2 routes E2 - Before summary address
Sh ip route:
30.0.0.0/16 is subnetted, 4 subnets
O E1 30.2.0.0 [110/84] via 141.1.54.4, 00:00:10, Serial0/0
[110/84] via 141.1.145.4, 00:00:10, FastEthernet0/0
O E2 30.3.0.0 [110/20] via 141.1.54.4, 00:00:10, Serial0/0
[110/20] via 141.1.145.4, 00:00:10, FastEthernet0/0
O E1 30.0.0.0 [110/84] via 141.1.54.4, 00:00:06, Serial0/0
[110/84] via 141.1.145.4, 00:00:06, FastEthernet0/0
O E2 30.1.0.0 [110/20] via 141.1.54.4, 00:00:11, Serial0/0
[110/20] via 141.1.145.4, 00:00:11, FastEthernet0/0
After summary address:
O E1 30.0.0.0 [110/84] via 141.1.54.4, 00:00:07, Serial0/0
[110/84] via 141.1.145.4, 00:00:07, FastEthernet0/0
1 Route E1 and 3 routes E2 - Before summary address
Sh ip route:
30.0.0.0/16 is subnetted, 4 subnets
O E2 30.2.0.0 [110/20] via 141.1.54.4, 00:00:14, Serial0/0
[110/20] via 141.1.145.4, 00:00:14, FastEthernet0/0
O E2 30.3.0.0 [110/20] via 141.1.54.4, 00:00:14, Serial0/0
[110/20] via 141.1.145.4, 00:00:14, FastEthernet0/0
O E1 30.0.0.0 [110/84] via 141.1.54.4, 00:00:26, Serial0/0
[110/84] via 141.1.145.4, 00:00:26, FastEthernet0/0
O E2 30.1.0.0 [110/20] via 141.1.54.4, 00:00:14, Serial0/0
[110/20] via 141.1.145.4, 00:00:14, FastEthernet0/0
After summary address:
30.0.0.0/14 is subnetted, 1 subnets
O E2 30.0.0.0 [110/20] via 141.1.54.4, 00:00:20, Serial0/0
[110/20] via 141.1.145.4, 00:00:20, FastEthernet0/0
I was expecting that some kind of preference was given to E1 routes, but
apparently only when untying the number of routes.
Can anybody shed some light/document on this?
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