LIVE SCENARIO EXAMPLE
Simply create the vlan
Ip address <>
Newly created vlan has to be incorporated in HSRP too. Analyze design in your network.
Two types of design
Single vlan : Single vip : Single group
Multiple vlan’s : Multiple vip’s : Single group
showing both type of combined designs
A#sh standby br
Interface Grp Prio P State Active Standby Virtual IP
Vl1 12 200 P Active local 10.25.34.12 10.25.34.1
Vl15 15 200 P Active local 10.25.34.131 10.25.34.129
Vl20 20 200 P Active local 10.25.35.67 10.25.35.65
Vl110 12 200 P Active local 10.25.32.12 10.25.32.1
Vl111 111 200 P Active local 10.25.34.243 10.25.34.241
Vl112 12 200 P Active local 220.127.116.11 18.104.22.168
Vl150 14 200 P Active local 10.25.36.12 10.25.36.1
Vl190 12 200 P Active local 10.25.36.131 10.25.36.129
Vl191 12 200 P Active local 10.25.36.195 10.25.36.193
Here, Vlan 1, vlan110, vlan112, vlan190 all are load shared using same group, HSRP group number 12.
Whereas, all other vlan’s have one to one mapping, different group for different vlan.
You need to decide, new vlan will be utilized with which type of design from above?
For HSRP to work properly, we need to have Layer 2 connectivity between HSRP members.
Over the Layer 2 connectivity, we need to allow newly created vlan, to avoid HSRP dual active scenario.
To confirm Layer two connectivity, below is the example
Get mac address using “sh ip arp”
Use Layer 2 traceroute
In below command, put source & destination mac captured from above arp command output.
ROUTERA#traceroute mac 000e.d79c.67ff 000e.d79c.67ff vlan 1
Source 000e.d79c.67ff found on ROUTERA
ROUTERA (10.25.34.11) : Po1 => Po1
Destination 000e.d79c.67ff found on ROUTERA
Layer2 trace completed.