03-05-2008 09:03 AM - edited 03-05-2019 09:33 PM
My company has 2 building in same campus.Before we have single VTP domain -common vlan enviroment.we have trunk connectivity between distribution switches of Bldg1 and Bldg2.
Now we are going to bulid saperate VTP domians for Bldg1 and bldg2 -switching enviroment for both buildings. Only layer 3 connectivity.
Issue is we have voice server in vlan X at bldg1 and some voice server in same vlan X at bldg 2.
voice servers are criticle and I can not migrate them,So I have to extend the same vlan (subnet) over layer 3.
I have found one soln. LAM-Local Area Mobility.Can it work for my issue? if yes Is there any overhead of LAM as this vlan x has criticle voice servers.
Is there any other solution?
03-05-2008 09:24 AM
Sanket:
I was in a similar situation once with one of my clients and I resolved it by using a Metro Ethernet connection between 2 layer 3 switches, in which I passed routing updates between the two over a dot1q trunk.
I had a 3560 on one end and a 4506 on the other end. Both layer 3 enabled.
3560 Config:
vlan 2
Server_Vlan
vlan 21
Layer_3_peers
interface GigabitEthernet0/1
description Connection to TLS
switchport access vlan 21
switchport trunk encapsulation dot1q
switchport trunk native vlan 21
switchport mode trunk
load-interval 60
interface Vlan21
description Connection to TLS
ip address 172.16.200.5 255.255.255.248
no ip redirects
no ip unreachables
no ip proxy-arp
!
router eigrp 200
network 172.16.200.0 0.0.0.255
no auto-summary
4506 switch:
vlan 2
Server_Vlan
vlan 21
Layer_3_peers
interface GigabitEthernet2/1
speed 1000
duplex full
switchport access vlan 21
switchport trunk encapsulation dot1q
switchport trunk native vlan 21
switchport mode trunk
spanning-tree guard loop
interface Vlan21
description TLS WAN vlan
ip address 172.16.200.1 255.255.255.252
router eigrp 200
network 172.16.200.0 0.0.0.255
no auto-summary
=============================================
Vlan 21 was the vlan created for the layer 3 routed connections.
This set up allowed me to extend vlan 2 across the dot1q trunk, while still exchanging routes over it. Strange, I know!
HTH
If so, please rate my post
Victor
03-05-2008 09:43 AM
Thanks a lot Victor,
How can I control that only vlan2 would be expanded.Hows can Vlan 2 know that it is expanded as in config on trunk port there is no commnad perticuler to vlan2.
I would appreciate if you provide some details.
03-05-2008 09:49 AM
Sanket:
If you dont specify exactly which vlans to allow on the trunk, traffic from all vlans will be allowed by default. Otherwise, you would use the switchport trunk vlan allowed 2,21 command under the trunk interface.
HTH
Victor
03-05-2008 10:58 AM
03-05-2008 11:59 AM
It looks like you're trying to extend l2 across. If you have an mpls core, then AToMPLS, or Ethernet over MPLS would do the trick. If you not, l2tp would do it.
03-05-2008 01:34 PM
Can it impact voice traffic??As this subnet has voice servers.
Thanks
03-05-2008 01:38 PM
You mean, you have multiple CM arranged in a cluster across this extension? It should not as long as you're within the 40ms intercluster delay spec.
03-05-2008 01:45 PM
I am not sure what exactly..but a simple trunking done on the switch should do.
03-05-2008 01:50 PM
we have call centre so we have some application and monitring servers.I think l2tp will work in my case.
thanks
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