i have a need for a high availability solution for a default gateway
configuration. just finished the ccdp and thought it might be
interesting to try hsrp on a pair of 2514's. put some of that theory
to work. instead of highly resiliant i've managed to configure it for
mass failure. arg.., not exactly what i had in mind. now, any time i
take down 1 of the 4 links, the connect between 2 remote hosts dies.
this is in a lab (production is not a lab, production is not a lab...)
so it is a mystery i would like to solve, but it is not critical.
here is the basic config (hope it makes it):
pc host 1 -----+----- e0 router 1, e1 ----+--------- pc host 2
| |
|----- e0 router 2, e1 ----|
the routers act as a default gateway between the internal network
(represented by pc host 1) and the external world (represented by pc
host 2). i have used 10.3 and 10.4 /16 as the addresses for each side
of the divide. i want to run hsrp on both sets of router interfaces so
that in the event a router or an interface fails, the traffic impact is
minimized. in the real world pc host 2 will be a firewall and there
will be other hosts off that segment as well
looks easy. sounds plausible. read the cisco docs. looks like it
should work. minimal incantations before tickling the keyboard. key
in the configs and it fires up nicely. do the show standby thingee and
all looks cool. can ping the 2 stations end to end. most excellent.
put a router in debug mode. when i pull one of the 4 router cables the
router goes through a state change but no bits make it to the far end.
not even the shiney ones. bitstream courtesy of ping.
maybe i misunderstood what hsrp was suppose to do. the configs are
below, along with the show standby results. both are 2514's (2 aui's)
and both are running 12.2(1d). probably forgot to put the interface in
mumble mode or something equally easy. no laughter, please.
thanks in advance.
router 1
interface Ethernet0
ip address 10.3.255.2 255.255.0.0
no ip route-cache
no ip mroute-cache
standby 1 priority 200 preempt
standby 1 ip 10.3.0.2
!
interface Ethernet1
ip address 10.4.254.2 255.255.0.0
no ip route-cache
no ip mroute-cache
standby 2 priority 200 preempt
standby 2 ip 10.4.254.10
router 2
interface Ethernet0
ip address 10.3.255.1 255.255.0.0
no ip route-cache
no ip mroute-cache
standby 1 priority 225 preempt
standby 1 ip 10.3.0.2
!
interface Ethernet1
ip address 10.4.254.1 255.255.0.0
no ip route-cache
no ip mroute-cache
standby 2 priority 150 preempt
standby 2 ip 10.4.254.10
results of show standby
Router1#show standby
Ethernet0 - Group 1
Local state is Standby, priority 200, may preempt
Hellotime 3 holdtime 10
Next hello sent in 00:00:00.940
Hot standby IP address is 10.3.0.2 configured
Active router is 10.3.255.1 expires in 00:00:09, priority 225
Standby router is local
20 state changes, last state change 00:22:34
Ethernet1 - Group 2
Local state is Active, priority 200, may preempt
Hellotime 3 holdtime 10
Next hello sent in 00:00:01.676
Hot standby IP address is 10.4.254.10 configured
Active router is local
Standby router is 10.4.254.1 expires in 00:00:08
Standby virtual mac address is 0000.0c07.ac02
17 state changes, last state change 00:23:26
Router1#
Router2#show standby
Ethernet0 - Group 1
Local state is Active, priority 225, may preempt
Hellotime 3 holdtime 10
Next hello sent in 00:00:01.010
Hot standby IP address is 10.3.0.2 configured
Active router is local
Standby router is 10.3.255.2 expires in 00:00:09
Standby virtual mac address is 0000.0c07.ac01
24 state changes, last state change 00:22:04
Ethernet1 - Group 2
Local state is Standby, priority 150, may preempt
Hellotime 3 holdtime 10
Next hello sent in 00:00:01.272
Hot standby IP address is 10.4.254.10 configured
Active router is 10.4.254.2 expires in 00:00:09, priority 200
Standby router is local
32 state changes, last state change 00:22:25
Router2#
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