spanning tree with 3com

[fd_case17]

hi,

my topology is like this:

mulitiple catalyst acces switchs ( with 2 vlans : 1 for users xxx,1 for management 800) with one uplink to distribution ( 3com 4800g)

vlans users:      100,200,300,400 

vlan   management:      800

3com operates with RSTP and Ciso with Rpvst+

  How could I make 3com the Root Bridge for all vlans ,

cause in reality , the root bridge is one of the catalyst and 3com  flood all bpdus as any

[Ganesh Hariharan]

hi,
my topology is like this:
mulitiple
catalyst acces switchs ( with 2 vlans : 1 for users xxx,1 for
management 800) with one uplink to distribution ( 3com 4800g)
vlans users:      100,200,300,400  
vlan   management:      800
3com operates with RSTP and Ciso with Rpvst+
  How could I make 3com the Root Bridge for all vlans ,
cause in reality , the root bridge is one of the catalyst and 3com  flood all bpdus as any

Hi ,

Check out the below link for configuring STP in 3com switches hope that help !!

http://support.3com.com/infodeli/tools/switches/4500/3Com_Switch_4500_Quick_Reference_Guide.pdf

if helpful do rate the post

Ganesh.H

[milan.kulik]

Hi,

so far I understood 3Com was not supporting per-VLAN STP?

I.e., using one common STP instance for all VLANs?

In that case I would not recommend making it a root bridge.

HTH,

Milan

[fd_case17]

3com is my disitribution layer ,

cisco is my access layer,

for good design I have to make it the Root bridge,

and  if i use mst on cisco access and put all vlan in instance 0

?

thanx

[milan.kulik]

It might work then, hopefully.

Do your access switches support MST though?

Different vendor compatibility is always tricky, I remember a 3Com/Cisco issue caused by different STP cost for 100Mbps port, e.g.

BR,

Milan