topic Re: box to box redundancy in Application Networking

box to box redundancy

gaban — Thu, 11 Sep 2003 14:46:49 GMT

we bought 2 css 11501 and i am trying to configure them to do b2b redundancy.

I followed the link for the b2b configuration and here is our config

!*************************** GLOBAL ***************************

no restrict web-mgmt

ip redundancy

snmp name

snmp contact

snmp location

ip route 0.0.0.0 0.0.0.0 10.12.87.254 1

!************************* INTERFACE *************************

interface e1

phy 100Mbits-FD

description "Connects to 4006"

interface e8

bridge vlan 2

!************************** CIRCUIT **************************

circuit VLAN1

redundancy

ip address 10.12.87.200 255.255.255.0

circuit VLAN2

ip address 192.168.0.1 255.255.255.0

redundancy-protocol

!************************** SERVICE **************************

service 1

ip address 10.12.87.131

keepalive type tcp

keepalive port 80

active

service 2

ip address 10.12.87.38

keepalive type tcp

keepalive port 80

active

!*************************** OWNER ***************************

owner SMHN

content Test-config

add service 1

add service 2

vip address 10.12.87.201

active

!*************************** GROUP ***************************

group servers

add destination service 1

add destination service 2

vip address 10.12.87.201

active

When the master is up I can get to the web pages but

When I turn off the primary box the backup css becomes the master but I can't get to our web page.

Thanks,

gilbert

Re: box to box redundancy

d.parks — Thu, 11 Sep 2003 15:28:09 GMT

There was a bug in the B2B redundancy code at one point where the CSS would not gratuitious arp for the VIP address(es) when a failover occurs.

It would arp for the circuit address however.

To see if this is the problem, try clearing the next hop router's arp cache. (assuming there is a router between the client and CSS.)

Re: box to box redundancy

d.parks — Thu, 11 Sep 2003 15:29:16 GMT

I would also recommend that you take a look at VIP/Interface redundancy as an alternative to B2B. My experience is that it works much better.

Re: box to box redundancy

gaban — Thu, 11 Sep 2003 22:24:17 GMT

I actually found the problem My configs was not totally the same for both boxes. Although I too eas thinking it was a arp issue. THanks for the response.

Re: box to box redundancy

gaban — Thu, 11 Sep 2003 22:29:18 GMT

thanks for the reply. I did get the b2b to work but as you said it is not good. I actually tried a few failover scenarios with the b2b and it was not that bad but hoping for a better failover. I did try this VIP/interface but did not work. Will be troubleshooting now as to what i did wrong. I might also try the ASR.

thanks,

gilbert