etherchannel

[billyj1900]

I am trying to setup a L3 etherchannel between a switch and a router. The config is below. From the switch and the router I can see each other neighbors but I can ping each other. Does anyone know what I am missing?

S1

interface Port-channel1
no switchport
ip address 172.16.2.2 255.255.255.252
speed 100
duplex full
!
interface FastEthernet1/0/3
no switchport
no ip address
speed 100
duplex full
channel-group 1 mode on
!
interface FastEthernet1/0/4
no switchport
no ip address
speed 100
duplex full
channel-group 1 mode on
!
ip route 0.0.0.0 0.0.0.0 172.16.2.1
!

R1

!
interface Port-channel1
ip address 172.16.2.1 255.255.255.252
full-duplex
hold-queue 150 in
!
!
interface FastEthernet1/0
no ip address
speed 100
full-duplex
channel-group 1

!
interface FastEthernet1/1
no ip address
speed 100
full-duplex
channel-group 1
!

 

[VinceWhirlwind]

You mean they *can't* ping each other?

 

[VinceWhirlwind]

I'd do a show etherchannel, but also a sh ip route, just to make sure you don't have a duplicate subnet somehow.

 

[billyj1900]

Sh ethernnel shows the interfaces added in the switch not in the router but if I do a sh int po1 on the router I can see the interface.

sh arp doesn't show a duplicated subnet.

Yeah I think it is my router or ios c3745-adventerprisek9-mz.124-25d.bin.

 

[VinceWhirlwind]

I've never done an etherchannel to a router myself - if they want redundancy normally they get two routers and HSRP.

I would be testing how the router sets up an etherchannel by checking the options with the "channel-group" command.

Maybe the router's trying to negotiate, while the switch is just "on"?