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Cisco switch +alcatel switch

Posted on 2010-09-02
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Hi experts,

I want to cascade a New alcaltel switch to an exisiting cisco edge switch.I would be trunking through fibre..when connecting this new alcatel switch to the exisiting cisco edge switch what configuration changes njeeds to be done on both the switches to make the cascading work?what changes needs to be done with regards to STP and VTP for both the switches?

Thanks,
phoenix
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Question by:phoenix26
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mikebernhardt earned 2000 total points
ID: 33597750
I'm not familiar with alcatel switches, but I can tell you this:
1. VTP is Cisco-proprietary (I think) so set it to transparent mode on the cisco switch. I always do that anyway.
2. On the Cisco interface, set it to "speed nonegotiate" if the link won't come up.
3. Also on the Cisco switch, set the trunk encapsulation type to dot1q.
4. Verify the default native vlan on the alcatel. On Cisco it defaults to vlan 1 but it may not be that on the Alcatel. I recommend always using vlan 1 for the native vlan.
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by:phoenix26
ID: 33601521
Hi expert,

What about STP changes ,as one switch is alcatel and other is cisco ,what needs to be done in order to avoid spanning tree loop?Both are running as edge switches only.

Thanks,
phoenix

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by:mikebernhardt
mikebernhardt earned 2000 total points
ID: 33618721
If you're only putting a single link between them you don't have to worry about spanning tree anyway. But you will need to use MSTP 802.1s rather than Cisco's proprietary PVST or Alcatel's version of the same.
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by:phoenix26
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