Hi,
i have this scenario:
| ----P1----P2---|
PE1----| |----PE2
| ----P3----P4---|
IP Loop PE1: 5.5.5.5
There are 2 Gigabitethernet betweenn the router PE and the router P.
PE1 advertise 1.1.1.1/32 to PE2:
PE2#sh ip route 1.1.1.1
Routing entry for 1.1.1.1/32
Known via "bgp 65000", distance 200, metric 0, type internal
Last update from 5.5.5.5 01:57:03 ago
Routing Descriptor Blocks:
* 5.5.5.5, from 4.4.4.4 , 01:57:03 ago
Route metric is 0, traffic share count is 1
AS Hops 0, BGP network version 0
PE2 has 4 link (2 towards P2 and 2 towards P4) at equal cost to reach 5.5.5.5/32 via OSPF:
PE2# sh ip route 5.5.5.5
Routing entry for 5.5.5.5/32
Known via "ospf 65000", distance 110, metric 200, type inter area
Last update from 23.23.23.24 on GigabitEthernet8/0/0, 01:13:45 ago
Routing Descriptor Blocks:
* 22.22.22.21, from IP-P1, 01:13:45 ago, via GigabitEthernet3/0/0
Route metric is 200, traffic share count is 1
23.23.23.23, from IP-P1, 01:13:45 ago, via GigabitEthernet8/0/0
Route metric is 200, traffic share count is 1
22.22.22.22, from IP-P2, 01:13:45 ago, via GigabitEthernet3/0/0
Route metric is 200, traffic share count is 1
23.23.23.24, from IP-P2, 01:13:45 ago, via GigabitEthernet8/0/0
Route metric is 200, traffic share count is 1
If I look cef table I have all the 4 link too:
PE2# sh ip cef 5.5.5.5
5.5.5.5/32, version 3101050, epoch 0, per-destination sharing
0 packets, 0 bytes
Flow: AS 0, mask 32
tag information set, shared, all rewrites owned
local tag: 1541
via 22.22.22.21, GigabitEthernet3/0/0, 14 dependencies
traffic share 1
next hop 22.22.22.21, GigabitEthernet3/0/0
valid adjacency
tag rewrite with Gi3/0/0, 22.22.22.21, tags imposed {390}
via 23.23.23.23, GigabitEthernet8/0/0, 14 dependencies
traffic share 1
next hop 23.23.23.23, GigabitEthernet8/0/0
valid adjacency
tag rewrite with Gi8/0/0, 23.23.23.23, tags imposed {390}
via 22.22.22.22, GigabitEthernet3/0/0, 15 dependencies
traffic share 1
next hop 22.22.22.22, GigabitEthernet3/0/0
valid adjacency
tag rewrite with Gi3/0/0, 22.22.22.22, tags imposed {390}
via 23.23.23.24, GigabitEthernet8/0/0, 15 dependencies
traffic share 1
next hop 23.23.23.24, GigabitEthernet8/0/0
valid adjacency
tag rewrite with Gi8/0/0, 23.23.23.24, tags imposed {390}
0 packets, 0 bytes switched through the prefix
tmstats: external 0 packets, 0 bytes
internal 0 packets, 0 bytes
But if i Look the cef table for the address 1.1.1.1/32 I have only 1 link:
PE2# sh ip cef 1.1.1.1
1.1.1.1/32, version 6477717, epoch 0, per-destination sharing
0 packets, 0 bytes
Flow: AS 0, mask 32
tag information from 5.5.5.5/32, shared, all rewrites owned
local tag: 1541
via 5.5.5.5, 0 dependencies, recursive
next hop 22.22.22.22, GigabitEthernet3/0/0 via 5.5.5.5/32 (Default)
valid adjacency
tag rewrite with Gi3/0/0, 22.22.22.21, tags imposed {390}
Recursive load sharing using 5.5.5.5/32.
The question is: why PE2 doesn't utilize all the 4 link (towards P2 and P4) to reach 1.1.1.1/32?
Thanks in advance
Rgds
Gianluca
