4500x Dual Active Detection with LACP

[Mokhalil82]

Hi Guys

I have configured 2 4500x switches as a vss pair and vss is working fine. These will be connected to 2 stacks of 3750x switches with each stack having 2 switches.

                                 4500x 

                               /             \

         3750x Stack1                 3750xStack2

From Switch	Port No	Channel Group	To Switch	Port No	Channel Group	Media Type	Comment
3750X Stack1	Ten 1/1/1	1	4500X	Ten 1/1/1	1	10Gb SPF+	3750X TO 4500X Interlinks
3750X Stack1	Ten 2/1/1	1	4500X	Ten 2/1/1	1	10Gb SPF+	3750X TO 4500X Interlinks
3750X Stack2	Ten 1/1/1	2	4500X	Ten 1/1/2	2	10Gb SPF+	3750X TO 4500X Interlinks
3750X Stack2	Ten 2/1/1	2	4500X	Ten 2/1/2	2	10Gb SPF+	3750X TO 4500X Interlinks
4500x	Ten1/1/14		4500x	Ten1/1/14		10Gb SFP+	Dual-Active-Detection
4500x	Ten1/1/15		4500x	Ten1/1/15		10Gb SPF+	VSL Link
4500x	Ten1/1/16		4500x	Ten1/1/16		10Gb SPF+	VSL Link

The ports will be connected as above. From each stack there are 2 uplinks, 1 to each of the 4500x but virtually to the same 4500x as they are a virtual pair.

I have't configured the uplinks yet as im trying to get the dual active detection done first, in the config on the 4500x it does not give me the option for fast-hellos, it only list pagp

Switch(config-vs-domain)#dual-active detection ?
  pagp  Dual-active detection using PAgP

Anyone know why this may be

Thanks

[Parminder Nath]

Hi,

As per configuration guide for this platform we do have enhanced pagp only as dual active detection mechanism;

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/15-1-2/XE_340/configuration/guide/config/vss.html#wp1063718

Thanks,

Parminder

[Mokhalil82]

Thanks Parminder

I found that the IOS i was using did not support dual active detection with lacp. Ive just upgraded to version 3.5.3 and the option for fast hello is now there

Thanks again