C технологией Etherchannel тоже все очень интересно, делаем как написано на cisco.com:
c2950c-24-1#configure terminal
c2950c-24-1(config)#interface port-channel 1
c2950c-24-1(config-if)#switchport mode trunk
c2950c-24-1(config-if)#switchport trunk allowed vlan 1,6,500,501
c2950c-24-1(config-if)#exit
c2950c-24-1(config)#interface range fastethernet 0/25 - 26
c2950c-24-1(config-if)#switchport mode trunk
c2950c-24-1(config-if)#switchport trunk allowed vlan 1,6,500,501
c2950c-24-1(config-if)#channel-group 1 mode desirable
c2950c-24-1(config-if)#exit
c2950c-24-1(config)#exit
c2950c-24-1#rcommand 1
c2950c-24-2#configure terminal
c2950c-24-2(config)#interface port-channel 1
c2950c-24-2(config-if)#switchport mode trunk
c2950c-24-2(config-if)#switchport trunk allowed vlan 1,6,500,501
c2950c-24-2(config-if)#exit
c2950c-24-2(config)#interface range fastethernet 0/25 - 26
c2950c-24-2(config-if)#switchport mode trunk
c2950c-24-2(config-if)#switchport trunk allowed vlan 1,6,500,501
c2950c-24-2(config-if)#channel-group 1 mode desirable
c2950c-24-2(config-if)#exit
c2950c-24-2(config)#exit
c2950c-24-2#exit
c2950c-24-1#show etherchannel port
Channel-group listing:
-----------------------
Group: 1
----------
Ports in the group:
-------------------
Port: Fa0/25
------------
Port state = Up Mstr In-Bndl
Channel group = 1 Mode = Desirable-Sl Gcchange = 0
Port-channel = Po1 GC = 0x00010001 Pseudo port-channel = Po1
Port index = 0 Load = 0x00 Protocol = PAgP
Flags: S - Device is sending Slow hello. C - Device is in Consistent state.
A - Device is in Auto mode. P - Device learns on physical port.
d - PAgP is down.
Timers: H - Hello timer is running. Q - Quit timer is running.
S - Switching timer is running. I - Interface timer is running.
Local information:
Hello Partner PAgP Learning Group
Port Flags State Timers Interval Count Priority Method Ifindex
Fa0/25 SC U6/S7 H 30s 1 128 Any 30
Partner's information:
Partner Partner Partner Partner Group
Port Name Device ID Port Age Flags Cap.
Fa0/25 c2950c-24-2.inner.tu 0007.84ff.9fc0 20s SAC 10001
Age of the port in the current state: 00d:00h:23m:43s
Port: Fa0/26
------------
Port state = Up Sngl-port-Bndl Mstr Not-in-Bndl
Channel group = 1 Mode = Desirable-Sl Gcchange = 0
Port-channel = null GC = 0x00010001 Pseudo port-channel = Po1
Port index = 0 Load = 0x00 Protocol = PAgP
Flags: S - Device is sending Slow hello. C - Device is in Consistent state.
A - Device is in Auto mode. P - Device learns on physical port.
d - PAgP is down.
Timers: H - Hello timer is running. Q - Quit timer is running.
S - Switching timer is running. I - Interface timer is running.
Local information:
Hello Partner PAgP Learning Group
Port Flags State Timers Interval Count Priority Method Ifindex
Fa0/26 U4/S4 H 30s 0 128 Any 0
Age of the port in the current state: 00d:00h:00m:02s
c2950c-24-1#show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
u - unsuitable for bundling
U - in use f - failed to allocate aggregator
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) PAgP Fa0/25(Pd) Fa0/26(I)
--- END
То есть, каким-то образом получается, что порт fa0/26 на обоих свичах ну никак не желает становиться участником Etherchannel'а...
Может подскажет кто, где трабл?