Multiple etherchannels, one IP

[salmissupport]

Good morning,

We currently have two 3560Gs configured to be routers between our two vlans between servers and desktop users. The IPs on the 3560Gs are configured to be the default gateways of each vlan. My question is, could we configure multiple etherchannels to the same IP address? We use DELL 3448s as the user switches and DELL 5324s for the server switches. I was thinking of using the uplink ports which are Gigs from the 11 user switches...an etherchannel for each...but they would all have to share the same IP address on the 3560Gs. Is this possible? I can't seem to find anyone else trying this setup...is there a better way?

[amit-singh]

Hi,

This is not possible. Even 3560 only supports at Max 8 ports in an ether-channel not more than that. Does the switches on the other side support Layer 3 functaionality. If yes, then One way for this would be to configure the uplink ports as Layer 3 and can use the static route load-balancing.I will not recommned that as it will make you remember as whole lots of IP addresses.

-amit singh

[salmissupport]

Thanks for your reply...I guess maybe I didn't explain what I wanted to do every well. Here is a config file that I wrote...maybe this will make it easier to understand.

interface Port-channel1

description Interface .3 for 168 LAN

no switchport

ip address 192.168.168.3 255.255.255.0

!

interface Port-channel2

description Interface .3 for 167 LAN

no switchport

ip address 192.168.167.3 255.255.255.0

!

interface Port-channel3

description Interface .3 for 168 LAN

no switchport

ip address 192.168.168.3 255.255.255.0

!

interface Port-channel4

description Interface .3 for 167 LAN

no switchport

ip address 192.168.167.3 255.255.255.0

!

I wish I had the hardware to try this out but I don't so I'm just throwing it out there. But what I'd do is take the two uplinks from the Dell switch 1...create a LAG...and connect both to Portchannel1...then using the same switch in the vlan plug both uplinks from Dell switch 2 into Portchannel3...same vlan, same default gateway. Seems like it might work, ideas?

Thanks

[ankbhasi · Accepted solution]

Hi Friend,

You cannot have same subnet address on 2 interfaces on same switch.

You have defined Port channel 1 and Port channel 3 with same ip address same way you have defined Port channel 2 and Port channel 4 with same ip adress which is not possible and you cannot even define same subnet address on 2 interfaces on same switch. If you try to proceed with this config in actual you will get an error message as overlapping address.

HTH

Ankur

[amit-singh · Accepted solution]

I agree with Ankur on this. This will not work and you canot have the same ip on the 2 interfaces on the switch.

-amit singh

[salmissupport]

Thank you all for your input