for the first case, yes i waited for 15min but got the same result.

for the second case, i did configure the window xp with 150.150.150.150 as default gateway.

thanks a lot Lejoe!

I only make changes on active router while the c3 was shutdown, i configured the standby 1 ip 150.150.150.150 on d4( active router) , then i powered up the c3, c3 learns the new hrsp address as 150.150.150.150.

thanks a lot!

Hi Rick!

You raised a very good point. Indeed proxy arp was enabled. But I turned it off and performed my test and get the same result.

Below is the detail of my test.

s0----------------s0B2 s1--------------s0

D4 e0----------------sw---------------e0C3

where D4 e0 196.196.196.196.4, s0 199.199.199.4

C3 e0 196.196.196.3,s0 198.198.198.3

host(xp) has ip address 196.196.196.1

default gateway 150.150.150.150

B2 s0 199.199.199.2, s1 198.198.198.2

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

D4( disabling proxy arp)

4(config)#int e0

D4(config-if)#ip proxy-arpndby

D4(config-if)#no ip proxy-arp

show stand by on D4

#show standby

%SYS-5-CONFIG_I: Configured from console by consolew standby

Ethernet0 - Group 1

Local state is Active, priority 200, may preempt

Hellotime 3 holdtime 10

Next hello sent in 00:00:01

Hot standby IP address is 196.196.196.10 configured

Active router is local

Standby router is 196.196.196.3 expires in 00:00:09

Disabling proxy arp on C3

3(config)#int e0

C3(config-if)#no ip proxy-arp

C3(config-if)#exit

C3(config)#exit

Show stand by on C3

3#show standby

Ethernet0 - Group 1

Local state is Standby, priority 100

Hellotime 3 holdtime 10

Next hello sent in 00:00:00.000

Hot standby IP address is 150.150.150.150 configured

Active router is 196.196.196.4 expires in 00:00:08

Standby router is local

Now we change the hotstandby ip address to 150.150.150.150 on D4 andC3

C3

C3(config)#int e0

C3(config-if)#standby 1 ip 150.150.150.150

C3(config-if)#exit

D4

ig)#int e0

D4(config-if)#standby 1 ip 150.150.150.150

D4(config-if)#exit

show standby on C3 and D4

D4#show standby

Ethernet0 - Group 1

Local state is Active, priority 200, may preempt

Hellotime 3 holdtime 10

Next hello sent in 00:00:02

Hot standby IP address is 150.150.150.150 configured

Active router is local

Standby router is 196.196.196.3 expires in 00:00:08

C3#show standby

Ethernet0 - Group 1

Local state is Standby, priority 100

Hellotime 3 holdtime 10

Next hello sent in 00:00:00.152

Hot standby IP address is 150.150.150.150 configured

Active router is 196.196.196.4 expires in 00:00:08

Standby router is local

Now i pointed the window xp host connected to layer 2 switch to 150.150.150.150

\Documents and Settings\zee>ipconfig

:

Connection-specific DNS Suffix . :

IP Address. . . . . . . . . . . . : 196.196.196.1

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 150.150.150.150

Now I ping the !99.199.199.2 , the ip address of s0 of B2 which is connected to So of D4.

C:\Documents and Settings\zee>ping 199.199.199.2

Pinging 199.199.199.2 with 32 bytes of data:

Reply from 199.199.199.2: bytes=32 time=52ms TTL=254

Reply from 199.199.199.2: bytes=32 time=22ms TTL=254

Reply from 199.199.199.2: bytes=32 time=22ms TTL=254

Reply from 199.199.199.2: bytes=32 time=22ms TTL=254

Ping statistics for 199.199.199.2:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 22ms, Maximum = 52ms, Average = 29ms

..

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

Is it platform dependent behavior?

I was just wondering how the multilayer switches will behave in the similar scenario.

Thanks a lot!

thanks a lot Lejoe!

yes for the second part, after 15 min, i did change the string to avoid syslog messages " bad authentication from 196.196.196.3 remote router"

But even before i changed the string, the active router and standby router were there, .

Then i performed the second lab to demonstatre that indeed hot standby address can be on different subnet.

let me run my test again Jon, i will get back to you with results. I am using Cisco 2500 series routers.

Thanks a lot Jon!

Hi Jon ,Lejoe,Rick and languedoc!

Here is the fresh test.

D4e0----------------------------sw------------------------------e0C3

Router C3:

:

nterface Ethernet0

ip address 196.196.196.3 255.255.255.0

no ip redirects

standby 1 priority 100

standby 1 ip 196.196.196.10

Router D4:

nterface Ethernet0

ip address 196.196.196.4 255.255.255.0

no ip redirects

standby 1 priority 200

standby 1 preempt

standby 1 ip 196.196.196.10

Show standby on D4

Ethernet 0-group 1

Local state is Active, priority 200, may preempt

Hellotime 3 holdtime 10

Next hello sent in 00:00:01

Hot standby IP address is 196.196.196.10 configured

Active router is local

Standby router is 196.196.196.3 expires in 00:00:08

Show standby on C3

Ethernet0 - Group 1

Local state is Standby, priority 100

Hellotime 3 holdtime 10

Next hello sent in 00:00:02.636

Hot standby IP address is 196.196.196.10 configured

Active router is 196.196.196.4 expires in 00:00:09

Standby router is local

Now I configured the authentication " sarah1" on D4 ( active router)

g-if)#standby 1 authentication sarah1

D4(config-if)#e

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standbyx

it

D4(config)#

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

Now wait for 20 seconds.

We use standby on D4 after 40 seconds.

hernet0 - Group 1

Local state is Active, priority 200, may preempt

Hellotime 3 holdtime 10

Next hello sent in 00:00:01

Hot standby IP address is 196.196.196.10 configured

Active router is local

Standby router is 196.196.196.3 expires in 00:00:08

D4#

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

%STANDBY-3-BADAUTH: Bad authentication from 196.196.196.3, remote state Standby

Though D4 is showing " bad authentication from 196.196.196.3,remote state standby" but D4 is receiving the messages as can be seen that D4 still knows the standby router is 196.196.196.3

Jon I think this behavior is platform dependent.