VLAN Bridging configuraiton on a 6509 (Sup720) with IOS 12.2(14)SX1
I am installing a 6509 (sup 720) to replace a multi-vlan network running on a 4006. The two networks will interconnect during migration. Users on OLD VLAN1 are being moved to various VLANs on new. Servers are also on VLAN1. This OLD VLAN1 is a /19 subnet and but the servers are alrady grouped into a /24 subnet. I want to move the server VLAN from the VLAN1(default) to VLAN10. We can not change server network addresses.
My plan was to create a VLAN10 on the 6509 with the same network as VLAN1 - BUT _ with a /24 mask and no routing entry. I thought that I could bridge between VLAN1 and VLAN10. When all the servers have been moved to the new server switches (3750s), and all users have moved to otehr VLANs, VLAN1 can be disabled and the routing entry be placed on VLAN10.
This would free up many subnets from the original address space.
Can this be done?
I have not been able to get bridging working between two defined VLANs. Each VLAN was given the same bridge group address. Bridging was enabled. Only one VLAN had a routing entry. Worktstations on both VLANs were given addresses in same subnet. But I was not able to ping.
If bridging will not work, any ideas on other approaches to get off VLAN1 and regain subnets?
"Integrated routing and bridging (IRB) and concurrent routing and bridging (CRB) have deliberately been disabled on the Catalyst 6500 series switches and Cisco 7600 Series Internet Routers. You should use routable Layer 2 VLANs and VLAN interfaces for normal bridging and interVLAN routing. Bridge groups are supported only to bridge nonrouted protocols."
Re: VLAN Bridging configuraiton on a 6509 (Sup720) with IOS 12.2
You don't want to do this with bridging. Make sure both the /19 and /24 are in the routing tables of both routers, then enable proxy arp (ala the interface configuration command ip proxy-arp) on all the router interfaces to VLAN 1. If you do this, everything in the /24 range will need to be located in VLAN 10.
It is not very elegant but has worked many times for me in the past.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...