При двух включенных каналах:R2
R2#sh ip route 10.50.137.128
Routing entry for 10.50.137.128/27
Known via "connected", distance 0, metric 0 (connected, via interface)
Routing Descriptor Blocks:
* directly connected, via GigabitEthernet2/0.2
Route metric is 0, traffic share count is 1
R2#sh ip route 10.51.31.0
Routing entry for 10.51.31.0/27
Known via "connected", distance 0, metric 0 (connected, via interface)
Routing Descriptor Blocks:
* directly connected, via GigabitEthernet2/0.3
Route metric is 0, traffic share count is 1
R2#sh gl
R2#sh glbp br
Interface Grp Fwd Pri State Address Active router Standby router
Gi2/0.2 4 - 150 Active 10.50.137.129 local 10.50.137.130
Gi2/0.2 4 1 - Active 0007.b400.0401 local -
Gi2/0.2 4 2 - Listen 0007.b400.0402 10.50.137.130 -
Gi2/0.3 1 - 150 Active 10.51.31.1 local 10.51.31.2
Gi2/0.3 1 1 - Active 0007.b400.0101 local -
Gi2/0.3 1 2 - Listen 0007.b400.0102 10.51.31.2 -
R1
R1#sh ip route 10.50.137.128
Routing entry for 10.50.137.128/27
Known via "connected", distance 0, metric 0 (connected, via interface)
Routing Descriptor Blocks:
* directly connected, via Vlan2
Route metric is 0, traffic share count is 1
R1#sh ip route 10.51.31.0
Routing entry for 10.51.31.0/27
Known via "connected", distance 0, metric 0 (connected, via interface)
Routing Descriptor Blocks:
* directly connected, via Vlan3
Route metric is 0, traffic share count is 1
R1#sh glb
R1#sh glbp br
Interface Grp Fwd Pri State Address Active router Standby router
Vl2 4 - 50 Standby 10.50.137.129 10.50.137.131 local
Vl2 4 1 - Listen 0007.b400.0401 10.50.137.131 -
Vl2 4 2 - Active 0007.b400.0402 local -
Vl3 1 - 50 Standby 10.51.31.1 10.51.31.3 local
Vl3 1 1 - Listen 0007.b400.0101 10.51.31.3 -
Vl3 1 2 - Active 0007.b400.0102 local -
При отключении канала с R2:
R2#sh ip route 10.50.137.128
Routing entry for 10.50.137.128/27
Known via "ospf 1", distance 110, metric 13, type intra area
Last update from 10.51.28.6 on GigabitEthernet0/0, 00:00:17 ago
Routing Descriptor Blocks:
* 10.51.28.6, from 10.51.10.105, 00:00:17 ago, via GigabitEthernet0/0
Route metric is 13, traffic share count is 1
R2#sh ip route 10.51.31.0
Routing entry for 10.51.31.0/27
Known via "ospf 1", distance 110, metric 13, type intra area
Last update from 10.51.28.6 on GigabitEthernet0/0, 00:00:19 ago
Routing Descriptor Blocks:
* 10.51.28.6, from 10.51.10.105, 00:00:19 ago, via GigabitEthernet0/0
Route metric is 13, traffic share count is 1
R2#sh glbp br
Interface Grp Fwd Pri State Address Active router Standby router
Gi2/0.2 4 - 150 Init 10.50.137.129 unknown unknown
Gi2/0.2 4 1 - Init 0007.b400.0401 unknown -
Gi2/0.2 4 2 - Init 0007.b400.0402 unknown -
Gi2/0.3 1 - 150 Init 10.51.31.1 unknown unknown
Gi2/0.3 1 1 - Init 0007.b400.0101 unknown -
Gi2/0.3 1 2 - Init 0007.b400.0102 unknown -
R1#sh ip route 10.50.137.128
Routing entry for 10.50.137.128/27
Known via "connected", distance 0, metric 0 (connected, via interface)
Routing Descriptor Blocks:
* directly connected, via Vlan2
Route metric is 0, traffic share count is 1
R1#sh ip route 10.51.31.0
Routing entry for 10.51.31.0/27
Known via "connected", distance 0, metric 0 (connected, via interface)
Routing Descriptor Blocks:
* directly connected, via Vlan3
Route metric is 0, traffic share count is 1
R1#sh glbp br
Interface Grp Fwd Pri State Address Active router Standby router
Vl2 4 - 50 Active 10.50.137.129 local unknown
Vl2 4 1 - Active 0007.b400.0401 local -
Vl2 4 2 - Active 0007.b400.0402 local -
Vl3 1 - 50 Active 10.51.31.1 local unknown
Vl3 1 1 - Active 0007.b400.0101 local -
Vl3 1 2 - Active 0007.b400.0102 local -
PS Сам собрал такую же схему на столе. На таком же железе, все работает.