Cisco 2960 Configuration from a HP 2510

[lawrencegoetz]

At a college we have Ciscos 2960 and are trying to setup VLAN tagging and also using RST or MST. The traffic on the jack should get tagged vlan 248.

We were told by the college that Ciscos in the labs will not work with the Alcatel switch that provides access to the lab. That Alcatel is in Bridge 1x1 mode. The college will not change the configuration on the Alcatel.

We got the Ciscos to do VLAN tagging and can get network access. However the spanning-tree is not read properly. Cisco does not properly read the Alcatel's RSTP (since the Alcatel is doing tagging on the BPDUs). It places the root of the spanning tree under vlan1 instead of vlan248.

The college strongly recommends HP Procurves and we are using that as test.

The following is the configuration on the HP and it works with no effort (it reads the spanning-tree information as MST)

ProCurve Switch 2510B-24# show running-config

Running configuration:

; J9019B Configuration Editor; Created on release #Q.11.17

hostname "ProCurve Switch 2510B-24"

snmp-server community "public" Unrestricted

vlan 1

   name "DEFAULT_VLAN"

   untagged 25-26

   ip address dhcp-bootp

   no untagged 1-24

   exit

vlan 248

   name "VLAN248"

   untagged 1-24

   tagged 25

   exit

spanning-tree

We will end up getting HPs instead, if the Cisco cannot work with the Alcatels.

Thank you,

Lawrence

[flokki123]

hi lawrence,

as soon as you create a vlan on the cisco switch it will create a spanning-tree instance for that vlan, and therefore i would say that the bpdu on the cisco get tagged as well if they run over a trunk link.

have you checked if the native vlans are the same on both sides?

would be surprised if the cisco couldnt work flawlessly with the alcatel.

florian

[cadet alain]

Hi,

you should be running MST on the cisco switch.

Regards.

Alain

[ebarticel]

Maybe change the default pvst+ spanning-tree  to RSTP which is the industry standard and then they should become friends

Eugen