[j-nsp] ex vstp and cisco pvst

[Misha Gzirishvili]

Hi there, If I remember correctly, vlan1 do not works well between C and J.
due to mac address mismatches in BPDU.
Use edge ports on acess ports to prevent unwanted calculations, Use
spanning tree pathcost method long on cisco to adjust costs. And use rapid
pvst on Cisco.
HTH.

Regards,
Misha
On Apr 10, 2012 9:51 PM, "Mohammad" <masalbad at gmail.com> wrote:

> Hi All
>
>
>
> We have a layer 2 ring consists of 7 cisco 3750 ME switches terminated on
> two juniper EX4200 switches (EX-Primary) and (EX-Backup); the backhaul from
> EX-Primary to our HQ is fiber, while we are using a backup microwave link
> from EX-Backup to HQ. we have configured vstp on both EX switches and we
> have increased the link costs on the backup EX in order to block the port
> on
> the backup EX so that the traffic goes to primary EX and then through the
> fiber link to HQ. we have checked the that ports are blocked from the
> backup
> EX,,and everything is working as it should be.
>
> The problem is once we configure vstp on the EX switches we see the cpu
> utilization reached 100% for a short period of time and then every things
> goes fine, another thing we've noticed suddenly when there is a topology
> change in the network the EX malfunction for a short period of time and
> then
> gets back to normal operation !!!!
>
> We are using pvst on the cisco switches.switch port trunk allowed vlan
> 11,12,13 , etc. is configured on the cisco trunk port
>
> Vlan 1 is not configured on the juniper switches.vstp vlan all is
> configured
> on the juniper switch
>
> The question is:
>
> Shall we configure vlan1 on the juniper switches and put it as a native
> vlan
> on the trunk port facing the cisco switches and also on the trunk port
> connecting the two juniper switches?
>
> Shall we configure rapid pvst on the cisco switches instead of normal pvst?
>
> Any better ideas?
>
>
>
> Thank you in advance.
>
> Mohammad Salbad
>
>
>
>
>
>
>
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