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How To Configure Multiple S-Series Routers to Provide Redundancy for LSNAT Using VRRP

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TitleHow To Configure Multiple S-Series Routers to Provide Redundancy for LSNAT Using VRRP
Objective
Two or more S-Series can provide LSNAT redundancy by tieing the VIP to the state of the VRRP. All S-Series are configured with identical LSNAT config including the VIP. The VIP will be active on only the VRRP master and any router in a backup state will not reply to anything directed at the VIP.The router that is the Primary and backup router(s) is controlled by configuring the priority of VRRP highest on the router that will be the primary LSNAT router.
Environment
S-Series`
Procedure
1. Configure VRRP on the master and all backup routers with the master having the highest VRRP priority. Use a floating not physical IP so that a preempt delay can be configured to prevent a failed router from returning to master before routing protocols have converged.

VLAN 79 and a VR ID 2, were chosen at random for this example.

PrimaryLSNAT Router

interface vlan.0.79

ip address 192.0.2.2 255.255.255.0
vrrp create 2 v3-IPv4
vrrp address 2 192.0.2.1
vrrp preempt-delay 2 40
vrrp priority 2 200
vrrp enable 2
no shutdown
exit


Backup Router
interface vlan.0.79

ip address 192.0.2.3 255.255.255.0
vrrp create 2 v3-IPv4
vrrp address 2 192.0.2.1
vrrp preempt-delay 2 40
vrrp priority 2 50
vrrp enable 2
no shutdown
exit


2. Create the server farm on all routers

ip slb serverfarm Web
real 192.0.2.114 port 80
inservice
exit
real 192.0.79.115 port 80
inservice
exit
exit

4. Tie the LSNAT virtual server to the VRRP state on all routers by configuring the VRRP parameter with VLAN and VR ID, under the vserver

ip slb vserver WebServer
virtual 203.0.113.10 tcp 443
serverfarm Web
vrrp interface vlan.0.79 2
inservice
exit
Additional notes

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