I'm configuring a 4006 with a network module 4418 gb with 2 Uplink port and 16 overbloked port (do not support ISL encapsulation) and one 48 x 10/100 port .. Actually we use 8 switches from 3500 family they have all a Giga link on a 3508 and a backup link on a 3548 , we have configured Spanning tree load balancingport priority (giga for Uplink and one of the fa for backup ) These switches use ISL encapsulation The Plan is to migrate these switches on the 4006 , but I need to turn off the ISL encapsulation on the 3500 Switches and then let the giga port on negotiatet mode .. but I can let the FA port with ISL , So At the end I will have ISL on the FA port and on giga port 802.1q .. IS IT GOOD ??
I think for general support issues, I would implement only one trunking protocol. I am sure it will work by mixing and matching the protocol, but you could have support issues when trying to resolve a problem.
Since your Cat 4000's support 802.1q, thats the one I would go with.
Someone else may be able to verfy this, but I believe Cisco has made some kind of annoucement endorsing the use of 802.1q over ISL?? Anyone?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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