HSRP with Interface VLANs

王朝other·作者佚名  2008-05-31
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IntrodUCtion

In this configuration, we have two Catalyst 6509 switches, each with two Multilayer Switch Feature Cards (MSFCs), for a total of four routers. Our strategy is to have the MSFC-a1 in the diagram below route for odd virtual LANs (VLANs), as the PRimary router, and MSFC-b1 to route odd VLANs as the backup router. For even VLANs, we want MSFC-b2 to be the primary router and MSFC-a2 to be the backup router.

Note: The backup routers (MSFCs) don't have a standby priority eXPlicitly assigned so they default to priority 100. We add the standby preempt statement so that if the primary router goes down and comes back up, it resumes the highest priority, or preempt control.

MSFC-a1配置信息:

msfc-a1#

!

hostname msfc-a1

!

!

interface Vlan1

ip address 1.1.1.2 255.255.0.0

standby 1 priority 110 preempt

standby 1 ip 1.1.1.1

!

interface Vlan3

ip address 3.1.1.2 255.255.0.0

standby 3 priority 110 preempt

standby 3 ip 3.1.1.1

!

!

end

MSFC-a2配置信息:

msfc-a2#

!

hostname msfc-a2

!

!

interface Vlan2

ip address 2.1.1.3 255.255.0.0

standby 2 ip 2.1.1.1

!

interface Vlan4

ip address 4.1.1.3 255.255.0.0

standby 4 ip 4.1.1.1

!

!

end

MSFC-b1配置信息:

msfc-b1#

!

hostname msfc-b1

!

!

interface Vlan1

ip address 1.1.1.3 255.255.0.0

standby 1 ip 1.1.1.1

!

interface Vlan3

ip address 3.1.1.3 255.255.0.0

standby 3 ip 3.1.1.1

!

!

end

MSFC-b2配置信息:

msfc-b2#

!

hostname msfc-b2

!

!

interface Vlan2

ip address 2.1.1.2 255.255.0.0

standby 2 priority 110 preempt

standby 2 ip 2.1.1.1

!

interface Vlan4

ip address 4.1.1.2 255.255.0.0

standby 4 priority 110 preempt

standby 4 ip 4.1.1.1

!

!

!

end

相关命令与讲解如下:

debug and show Commands

Verify that HSRP is working by using the show standby command. In the output below, MSFC-a1 sees its backup router as "Standby router 3.1.1.3."

msfc-a1#show standby

Vlan1 - Group 1

Local state is Active, priority 110, may preempt

Hellotime 3 holdtime 10

Next hello sent in 00:00:01.588

Hot standby IP address is 1.1.1.1 configured

Active router is local

Standby router is 1.1.1.3 expires in 00:00:08

Standby virtual mac address is 0000.0c07.ac01

Vlan3 - Group 3

Local state is Active, priority 110, may preempt

Hellotime 3 holdtime 10

Next hello sent in 00:00:02.092

Hot standby IP address is 3.1.1.1 configured

Active router is local

Standby router is 3.1.1.3 expires in 00:00:08

Standby virtual mac address is 0000.0c07.ac03

When we issue the show standby command from MSFC-b1, we see that for VLAN 1 and 3, MSFC-b1 is the backup or standby router: "Local state is Standby, priority 100." The active router is 1.1.1.2, or MSFC-a1, which has priority 110. Since 110 is greater than 100, MSFC-a1 is the active router.

msfc-b1#show standby

Vlan1 - Group 1

Local state is Standby, priority 100

Hellotime 3 holdtime 10

Next hello sent in 00:00:01.440

Hot standby IP address is 1.1.1.1 configured

Active router is 1.1.1.2 expires in 00:00:09

Standby router is local

Standby virtual mac address is 0000.0c07.ac01

Vlan3 - Group 3

Local state is Standby, priority 100

Hellotime 3 holdtime 10

Next hello sent in 00:00:01.478

Hot standby IP address is 3.1.1.1 configured

Active router is 3.1.1.2 expires in 00:00:09

Standby router is local

Standby virtual mac address is 0000.0c07.ac03

When HSRP isn't configured correctly, you see show standby output similar to that below, which shows MSFC-b2 doesn't see its HSRP partner.

msfc-b2#show standby

Vlan2 - Group 2

Local state is Active, priority 110, may preempt

Hellotime 3 holdtime 10

Next hello sent in 00:00:02.904

Hot standby IP address is 2.1.1.1 configured

Active router is local

Standby router is unknown expired

When you see this output, first check that the configuration is correct. Then verify that all the VLANs are passing through the trunk between the two switches. In the output below, VLANs 1 through 4 are passing through correctly.

Switch (enable)#show trunk 8/1

Port Mode Encapsulation Status Native vlan

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

8/1 desirable n-isl trunking 1

Port Vlans allowed on trunk

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

8/1 1-1005

Port Vlans allowed and active in management domain

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

8/1 1-4

Port Vlans in spanning tree forwarding state and not pruned

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

8/1 1-4

If you're still running into issues, ensure that the virtual VLAN interfaces are up by issuing the show interface vlan command.

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