Standby config in 6509

Answered Question
Dec 25th, 2008
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Hi,


How can I configure 6509 switch to have a standby capabalities? How does it work? (show standby). Thanks.


Cheers!

Gagamboy

Correct Answer by Giuseppe Larosa about 8 years 3 months ago

Hello Irvine,


show standby refers to the HSRP protocol that provides a Virtual default gateway on a vlan.


Using HSRP makes sense if you have two devices routers or multilayer switches (even of different models) that can be the exit point for clients in a vlan


on a C6500 the standby configuration is performed on L3 SVI Vlans


interface vlan 50

ip address 10.10.50.3 255.255.255.0

standby 50 ip 10.10.50.1

standby 50 preempt

standby 50 priority 105

standby 50 track vlan 10


this an example, default priority is 100 the highest priority router becomes active.

the VIP address is an address in the same IP subnet of the vlan interface


HSRP emulates VIP 10.10.50.1 at both L3 and L2 using a well known mac address that in the righmost byte has 0x32 = 50


On a multilayer switch you can reuse the same group number (50 in the example) on different SVI VLans but VIP address has to be given accordingly to vlan subnet


And again this is useful if you have multiple L3 devices serving the same subnet otherwise you are just preparing to install a second router/multilayer switch



Hope to help

Giuseppe



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Correct Answer
Giuseppe Larosa Fri, 12/26/2008 - 09:14
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Hello Irvine,


show standby refers to the HSRP protocol that provides a Virtual default gateway on a vlan.


Using HSRP makes sense if you have two devices routers or multilayer switches (even of different models) that can be the exit point for clients in a vlan


on a C6500 the standby configuration is performed on L3 SVI Vlans


interface vlan 50

ip address 10.10.50.3 255.255.255.0

standby 50 ip 10.10.50.1

standby 50 preempt

standby 50 priority 105

standby 50 track vlan 10


this an example, default priority is 100 the highest priority router becomes active.

the VIP address is an address in the same IP subnet of the vlan interface


HSRP emulates VIP 10.10.50.1 at both L3 and L2 using a well known mac address that in the righmost byte has 0x32 = 50


On a multilayer switch you can reuse the same group number (50 in the example) on different SVI VLans but VIP address has to be given accordingly to vlan subnet


And again this is useful if you have multiple L3 devices serving the same subnet otherwise you are just preparing to install a second router/multilayer switch



Hope to help

Giuseppe



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