Re: Extending Vlan's on a 6509

i-gil · ‎11-07-2002

Ok. I really need some help. I currently have (2) two 6509's, each of them have an MFSC card and (2) two 48 port blades.

All of the ports on the blades are broken up into seperate vlans. As shown in the following:

interface Vlan1

description Management VLAN

ip address 10.10.10.2 255.255.255.0

no ip redirects

no ip mroute-cache

load-interval 30

standby ip 10.10.10.1

standby priority 150

!

interface Vlan2

description Customer A

ip address 10.10.11.2 255.255.255.0

no ip redirects

load-interval 30

standby ip 10.10.11.1

standby priority 150

!

interface Vlan3

description Customer B

ip address 10.10.12.2 255.255.255.0

no ip redirects

load-interval 30

standby ip 10.10.12.1

standby priority 150

Each of the 6509's is configured the same with minor variations here are the examples from the second 6509:

interface Vlan1

ip address 10.10.10.3 255.255.255.0

no ip redirects

no ip mroute-cache

load-interval 30

standby ip 10.10.10.1

standby priority 100

!

interface Vlan2

description Customer A

ip address 10.10.11.3 255.255.255.0

no ip redirects

load-interval 30

standby ip 10.10.11.1

standby priority 100

!

interface Vlan3

description Customer B

ip address 10.10.12.3 255.255.255.0

no ip redirects

load-interval 30

standby ip 10.10.12.1

standby priority 100

The 6509's have an ISL trunk between them, one is set as the VTP server as show here:

#vtp

set vtp domain cyberluck

set vtp mode server

set vtp v2 disable

set vtp pruning disable

set vtp pruneeligible 2-1000

clear vtp pruneeligible 1001-1005

The other is set as the client, as shown here:

#vtp

set vtp domain cyberluck

set vtp mode client

set vtp pruneeligible 2-1000

clear vtp pruneeligible 1001-1005

set dot1q-all-tagged disable

The reason for our current layout is that we have a server farm, each of the servers have (2) nics and each connects to both of the 6509's this is done for failover purposes and load balancing. Here is my problem:

I need to be able to extend the vlans out from the 6509's to Cisco 2950 switches as shown in the diagram. I just can get started on the config. I am drawing a total blank on how to do this. I am worried about routing loops and everything else. Could someone please help me out. Thanks

rsissons · ‎11-07-2002

There is no diagram but I am assuming that you are adding ISL trunks to the 2950 switches. This is just going to extend the layer 2 switched environment and not change the layer 3, ie IP, environment, which is implemented in the MSFCs, so the concept of causing a routing loop does not apply.

At the layer 2 level, there is is possibility of having a loop if you have redundant links, eg if the 2950s are cross connected to both the 6500s, and this is exactly what spanning tree is designed to solve. So long as you run spanning tree, which is enabled by default, throughout your topology, you should be ok.