09-14-2006 06:29 AM - edited 03-03-2019 05:02 AM
I have two 3550's (24 port each) and 2811 router. I have two gropus of users 16 and 32. My router is connected to the rmote site and it has two fast ethernet ports available.
Now i need to configure this in such a way that even if one switch failes at least somes users of both the groups should communacate. So waht I did is
I divided both the groups on the two switches like (8 and 16) on each. Connected the two swithes using a trunk. NOw I want to know how to connect my router.
09-14-2006 06:44 AM
You should trunk each FastEthernet on the 2811 and connect each link to a different switch.
This should provide the required redundancy.
09-14-2006 07:34 AM
Hi
Thanx for your response. BUt i ahve only one dhcp server which is in my vlan 2. One more question is should i create SVI's for both the vlans on each fastethernet interface.
09-14-2006 07:41 AM
You can setup the ip helper-address in the 2811. That should address your DHCP issue.
I recommend letting the 2811 doing the routing between VLANs thus no need for SVIs on the 3550s.
09-14-2006 10:11 PM
I have additional comment about configuring multiple VLANs on your 2811...
I don't believe you can configure VLAN interfaces on the 2811, out of the box. What you can do, however, is configure each built-in FE port on the router to use 802.1Q encapsulation. Here's what you do:
interface fa0/0
description Trunk To Switch no. 1, VLANs 10 & 20
no ip address
interface fa0/0.10
description Connected to VLAN 10
encapsulation dot1q 10
ip address 10.10.10.1 255.255.255.0
no shutdown
interface fa0/0.20
description Connected to VLAN 20
encapsulation dot1q 20
ip address 10.10.20.1 255.255.255.0
no shutdown
Do the same thing for Fa0/1.
HTH
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