Need help with backup VTP Server

[veilside]

Hello,

our network have a switch Cisco 4506 that act as Core switch holds the VLANs database and VTP server and configured with interVLAN routing as there are IP gateways configured for every VLAN, my question is how I can configure another Layer 3 switch to be as a backup if the Core switch is down all VLANs and interVLAN routing keep working until the Core switch is back.

Many thanks for your help.

 

[stubnski]

Hi,

There are a few ways but the cheapest and easiest is HSRP/VRRP/GLBP. You will need to duplicate every core to switch connection on the backup core and a trunk allowing all vlans between cores but the config is very simple. Also, it is my personal preference and it requires more administrative overhead but I would suggest not using VTP. Below is a basic HSRP config that would need to be on every VLAN you want backed up.

Primary Core for HSRP configuration:

interface vlan 100
ip address 10.11.12.2 255.255.255.0
standby version 2
standby 100 ip 10.11.12.1
standby 100 ip priority 110
standby 100 preempt
standby 100 track tengigabitethernet0/1 15

Backup Core for HSRP configuration:

interface vlan 100
ip address 10.11.12.3 255.255.255.0
standby version 2
standby 100 ip 10.11.12.1
standby 100 preempt
standby 100 track tengigabitethernet0/1 15