HSRP issues with Bridging

[l-harvey]

I have connected a 6513 to a 5513, no problems. But when I enable HSRP between the RSM and the MSFC the I have issues with the Vlans with bridge-group 1 set up. ie,

RSM 5513

interface Vlan1

description Management and Trunking

ip address 10.1.1.1 255.255.0.0

standby 1 ip 10.1.1.3

standby 1 priority 110

standby 1 preempt

!

interface Vlan8

description Education

ip address 10.8.1.1 255.255.0.0

ipx network 8B encapsulation SAP

no ipx pad-process-switched-packets

standby 1 ip 10.8.1.3

standby 1 priority 110

standby 1 preempt

bridge-group 1

6513 IOS

interface Vlan1

description Management and Trunking

ip address 10.1.1.2 255.255.0.0

no ip redirects

no ip proxy-arp

no logging event link-status

standby 1 ip 10.1.1.3

!

interface Vlan8

description Education

ip address 10.8.1.2 255.255.0.0

no ip redirects

no logging event link-status

shutdown

ipx network 8B encapsulation SAP

no ipx pad-process-switched-packets

standby 1 ip 10.8.1.3

bridge-group 1

Vlan 1 ok but HSRP in vlan 8 just flaps HELP

[Georg Pauwen]

Hello,

not sure if this is a typo, but your VLAN 8 interface on your 6513 is in ´shutdown´ state. Can you try and enable it (no shutdown) and see if that makes a difference ?

Regards,

Georg

www.solutionfinders.nl

[l-harvey]

Sorry the reason it's in shutdown is because it flaps.

I have more than these two vlans. The config was an example. I can only have one vlan with Bridging enables on both devices, as soon as I add a second vlan with bridging flapping starts. This seems to be a STP issue but with two 5513 and RSMs no issues. Only since I installed the 6513 as a replacement for one of the 5513s. I haven't played with the STP default options as this is where my knowledge is limited.

Example of error message when two vlans have bridging eabled

Sep 19 13:10:42.725 BST: %DUAL-5-NBRCHANGE: IP-EIGRP 1: Neighbor 10.8.1.2 (Vlan8) is down: peer restarted

Sep 19 13:10:43.065 BST: %DUAL-5-NBRCHANGE: IP-EIGRP 1: Neighbor 10.8.1.2 (Vlan8) is up: new adjacency

IP and IPX only vlans no issues

[andrew.butterworth]

The reason is the standby Group number being the same on the VLAN interfaces. You are limited with the number of MAC addresses available on the Cat6000 Sup2/MSFC2 you have. If you do a show interfaces on the 6000 you will see that they all have the same MAC address and you can't change them. The same logic applies to HSRP; identical numbered HSRP groups use the same virtual MAC address so bridging on VLAN interfaces with the same HSRP group number will generate errors.

http://www.cisco.com/en/US/partner/products/hw/switches/ps708/products_configuration_guide_chapter09186a008007e6cf.html

http://www.cisco.com/en/US/partner/products/hw/switches/ps700/products_qanda_item09186a008011c6bb.shtml

Andy

[l-harvey]

My CCo will not access these short cuts.

But the MSFC 2 will only support 16 standby groups I have over 35 Vlans.

[Kevin Dorrell]

You have both VLANs using the same standby group, group 1. I don't know whether this is really the problem, by I have always configured each VLAN on a different standby group. Try changing all the config lines for VLAN8 to "standby 2 ...", or even "standby 8 ... " if you want to use clearer numbering.

Kevin Dorrell

Luxembourg.

[l-harvey]

The MSFC on the 6513 will only support maximum of 16 standby groups I have over 35 Vlans.

I have noticed that the bridge 1 protocol on the 5513 is set to ieee and the 6513 is set to vlan-bridge due to the 6513 not supporting ieee I will try the next downtime window to change the protocol on the 5513 to vlan-bridge.