Problem: Isolated VLANs with IRB 3550/2900

From: Chris Hugo (chrishugo@yahoo.com)
Date: Fri Sep 27 2002 - 15:36:16 GMT-3


Hi Folks,

I have and interesting dilemma with my switch. Let me paint the picture.

I have one switch. this switch has two vlans and one trunk. the trunk is connected to a router that is running dot1q. Bridging is run between two out of the three sub-interfaces.

The two sub-int that is bridging belong to one bridge-group. I am running IRB and ip is running on the IRB int.

The other interface is running ip and not in the bridge group but in a separate subnet.

Their are two routers that are connected to the switch but are in different vlans.

The switch management vlan is also included in the router that is running IRB. The default gateway on the switch that points to the IRB interface.

#1 host that is in the same subnet but on a vlan other than the management vlan of the switch.

#2 host that is in a different subnet but on a vlan other than the management vlan of the switch.

The Problem:

Switch can reach all interfaces on all hosts (routers) but not host #2.

I believe the switch is not using the default gateway since host #2 ip add is in the same subnet. And the fact that host #2 is in a different vlan will isolate itself from the management vlan. The router can ping ALL interfaces btw.

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How do we fix this problem? Did I miss something important in Clark/Hamilton. I know it must be something. If you need me to paint more pictures let me know.

Please Help I Know It's Friday :)

chris hugo

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