09-22-2003 03:30 AM - edited 03-02-2019 10:30 AM
Hi
I am connecting 2 buildings together over a Laser line of site link.On both sides of the Link are 2 3550 Layer 3 switches.I just need someone to check if what I am trying to do is correct.
I am setting up a routed hop between the 2 switches by setting up the ports on both sides in the same vlan and IP subnet.
this link is actually connecting 2 different companies together because of an aquisition.
The one side has 11 vlans and the other side has everything in 1 Vlan which is the default.
Do i need to setup the ports that the laser device is connecting to as a 802.1q trunk or ISL trunk in order for All the Vlans to communicate between each other.I will also configure EIGRP on both layer 3 switches in order to advertise the networks to us and vice versa.
The laser link has got a wireless backup link which I would like to let eigrp pickup the primary route and if that fails the wireless will become the prefered route to the destination networks on the other side.
I was going to use rapid spanning tree , but I decided not to in order to avoid one huge spanning tree.Much safer going for the Layer 3 routing or routed hop option with the switches.
Can someone point me in the right direction and just confirm that I am on the right track of getting this Laser link working with 3550 Layer 3 switches on both sides of the link.
Thanks so Much for you help....
09-22-2003 03:39 AM
If you are running the link as a routed link, then don't set it up as a trunk of any type. The 3550's should learn about the networks (vlans) on the other side, and route to them through the laser link.
Russ.W
09-22-2003 04:06 AM
Set the ports up as a Layer-3 routed link:
!Switch #1
interface fastethernet0/1
no switchport
ip address 10.1.1.1 255.255.255.252
!
!Switch #2
interface fastethernet0/1
no switchport
ip address 10.1.1.2 255.255.255.252
Obviously use your own IP addressing scheme and make sure you are either running a routing protocol or have static routes covering the networks available either side of the link (run a routing protocol...)
Andy
09-22-2003 09:20 AM
Thanks guys
I appreciate your help.
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