11-12-2010 02:27 PM - edited 03-04-2019 10:27 AM
I would wondering if Flex Link would be supported on a layer 3 Etherchannel? The document states that is works on layer 2 ports or port channels and not vlan or layer 3 interfaces. Since I am defining my layer 3 on the sub-interfaces i was wondering if it is still supported on the layer 2 port channel.
My configuration on a 7606 will be as follows:
interface port-channel 1
switchport backup interface port-channel 2
interface port-channel 1.10
ip add 10.10.10.1 255.255.255.0
interface port-channel 1.20
ip add 10.10.20.1 255.255.255.0
interface port-channel 2
exit
interface port-channel 2.10
ip add 10.10.10.1 255.255.255.0
interface port-channel 2.20
ip add 10.10.20.1 255.255.255.0
We are trying to eliminate the need to create SVI because of the restrictions of 4000 vlans per 7606. We are connected this 7606 to a pair of 6500 and another pair of 6509 (not tied together) and our vlan tags may duplicate between the two (2) pair of 6500 switches.We do not at this time have VSS installed in either of our 6509 pairs but would like to provide redundancy from our 7606 to the 6509 until we can get VSS or a Nexus 7k.
Your input is appreciated.
11-15-2010 03:20 PM
In the example you give, flex link is not supported on Po1. Po1 isn't a layer 2 interface in this case since you have the subinterfaces configured with layer 3. This feature is only supported for layer 2 interfaces, like access or trunk ports.
See the output from my lab device. When Portchannel1 has layer 3 subinterfaces it won't let you configure the flex link because Po1 is not a switchport:
Switch(config-if)#switch backup int g2/28
Command rejected: Po1 not a switching port.
11-15-2010 06:38 PM
Great information. Thank you very much.
Do you know anyway I can have some redundant links between a single 7606 layer 3 switch and (2) 6509 switches NOT in VSS mode?
11-16-2010 04:16 PM
Looking more at your original post, you should know that using a subinterface on a 7600 is the same as using a Vlan like an SVI. Two subinterfaces cannot use the same Vlan ID.
7609(config)#int port-channel 1.1
7609(config-subif)#encapsulation dot1Q 200
7609(config-subif)#int port-channel 2.1
7609(config-subif)#encapsulation dot1Q 200
Command rejected: VLAN 200 not available
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