Summary
321
Router E is made a member of both Group 1 and Group 2. The lower pri-
ority of 90 ensures that Routers A and C will be the primary routers. The
authentication key is not really for security because it is transmitted in the
packet. The key helps prevent against incorrect configuration.
HSRP also provides support protocols other than IP, including Apple-
Talk, Banyan Vines, Novell IPX, DECnet, and XNS. This provides a com-
plete solution to providing fault tolerance on multi-access media.
Once you have HSRP configured, you can troubleshoot and monitor
HSRP with the show standby and debug standby commands. Because we
have already looked at the show standby command, we'll demonstrate only
the debug standby command:
Router#debug standby
Hot standby protocol debugging is on
Router#
00:15:32: SB1:FastEthernet0/0 Hello out 10.1.0.200 Active pri 100
hel 3 hol 10 ip 10.1.0.200
00:15:35: SB1:FastEthernet0/0 Hello out 10.1.0.200 Active pri 100
hel 3 hol 10 ip 10.1.0.200
00:15:38: SB1:FastEthernet0/0 Hello out 10.1.0.200 Active pri 100
hel 3 hol 10 ip 10.1.0.200
Notice that the hello is sent out 10.1.0.200 and is the active router with a pri-
ority of 100. The hello time is shown as 3 seconds with a holdtime of 10
seconds.
Summary
I
n this chapter, we discussed the different ways you can configure your
network to support redundant connections--specifically, default gateways.
The types of fault tolerance that we covered included Proxy Address Res-
olution Protocol (Proxy ARP), Internet Control Message Protocol (ICMP),
ICMP Router Discovery Protocol (IRDP), dynamic routing protocols, and
the Hot Standby Routing Protocol (HSRP).
We showed you how to configure HSRP and implement it in an internet-
work using Cisco routers.
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