RSTP between Extreme and Cisco

[James_Red1]

Hello,

Apologies for the the many posts. I'm relatively new to extreme.. Would just want to ask/seek help or sample configurations for anyone who has done RSTP config between Extreme and Cisco switches. Topology would be:

A----B
| |
C----D

A&B are Extreme, C&D are Cisco. All are tagged/trunk ports.

thank you,
James

[Jhonn_Bejar]

I'm four months watching extreme switches, everything was fine until I got to configure spanning tree.
on cisco virtually nothing to configure spanning tree with almost everything is automated.
but extreme it is very confusing.
If I enable pvst + must create a domain per vlan, associating ports, just watch the "show configuration stp" is long.
with that my clients are scared. They are accustomed to something practical and simple to configure.

I think that should change how extreme configure spanning tree

[Sumit_Tokle]

The above configuration may work.
The configuration is always depends on other end(Cisco) also.

[James_Red1]

Hi Sumit,

Can you give me a little more hint on the rstp config?  Will the basic config below work when interconnecting with Cisco?

3 VLANS will pass through the link, all ports tagged

VLAN100 - Test1, ports 1:1, 1:2 tagged
VLAN101 - Test2, ports 1:1, 1:2 tagged
VLAN102 - Test3, ports 1:1, 1:2 tagged

create stpd Test
configure stpd Test mode dot1w
configure stpd Test add vlan Test1 ports 1:1,1:2
configure stpd Test add vlan Test2 ports 1:1,1:2
configure stpd Test add vlan Test3 ports 1:1,1:2
configure stpd Test ports link-type point-to-point 1:1,1:2
configure stpd Test tag 100

Thanks!

[Sumit_Tokle]

Yes. every STPD domain has it's own priority.
You can play with priority or port cost to change the forwarding/blocking.

RSTP: Hint: Think about, how cisco works with RSTP. If there are 10 vlans configured with RSTP on Cisco then how many BPDU packet Cisco device will sent out? What is the TAG value those BPDU?

Depending upon that configure it on Extreme devices.

Please go through EXOS concept guide for further information.