Extended the LAN

Unanswered Question
Jan 25th, 2008
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I have four L3 switches in two different location.


One Location

Switch1-Active

interface Vlan10

ip address 10.140.49.5 255.255.255.0

standby priority 110

standby 1 ip 10.140.49.4

standby 1 preempt


Switch1-Standaby


interface Vlan10

ip address 10.140.49.6 255.255.255.0

standby 1 ip 10.140.49.4

standby 1 preempt

----------------------------------------

Other Location

interface Vlan10

ip address 10.140.49.6 255.255.255.0

standby priority 110

standby 1 ip 10.140.49.1

standby 1 preempt


Switch1-Standaby


interface Vlan10

ip address 10.140.49.7 255.255.255.0

standby 1 ip 10.140.49.1

standby 1 preempt


I want to connect two location with trunking but i donot want any L3 config because my customer do not want to breake the broadcast domain.



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Istvan_Rabai Sat, 01/26/2008 - 06:37
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Hi Anthony,


As far as I understand, you want to have 4 HSRP routers in the same VLAN, VLAN 10, to be in the same broadcast domain, and do load-balancing between a pair of routers.


First of all I have to tell you, that according to the Enterprise Composite Network Model, Cisco does not recommend to have so called end-to-end VLANs (that span across the distribution and core layers), because of difficulties in troubleshooting and manageability.


But if you want to build your network this way, you can use the following configs (this is just one of the possibilities):


One location:

Switch1-active:

interface vlan10

ip address 10.140.49.5 255.255.255.0

standby 1 priority 110

standby 1 ip 10.140.49.4

standby 1 preempt delay minimum 30 reload 30

! the delay is needed so the router has time to build up its routing table after reload.


Switch1-standby:

interface vlan10

ip address 10.140.49.6 255.255.255.0

standby 1 ip 10.140.49.4



The other location:

Switch1-active:

interface vlan10

ip address 10.140.49.8 255.255.255.0

standby 2 priority 110

standby 2 ip 10.140.49.1

standby 2 preempt delay minimum 30 reload 30


Swtich1-standby:

interface vlan10

ip address 10.140.49.7 255.255.255.0

standby 2 ip 10.140.49.1


This configuration will separate traffic between the 2 active HSRP routers. Of course, you need to configure the default-gateway addresses in the hosts accordingly:


Host in one building have to use 10.140.49.4 for default gateway, hosts in the other building have to use 10.140.49.1 for default gateway.



Cheers: Istvan










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