From: alain faure (alainfaure@xxxxxxxx)
Date: Fri Mar 01 2002 - 15:35:54 GMT-3
Hi,
Is it because you configured r3 first (so you have to wait ):
When a higher-priority router is discovered (the list of routers is polled at
5-minute intervals)
(from cisco CD)
Best regards
--- George Zhang <gyzhang63@hotmail.com> a icrit : > I have a question about
IRDP preference. Consider the following scenario:
>
> R3-E0-------------------E0-R4
> |
> |
> E0
> R1
>
> R3's config:
> in e0
> ip ad 172.16.1.3 255.255.255.0
> ip irdp
> ip irdp preference 300
>
> R4's config:
> in e0
> ip ad 172.16.1.4 255.255.255.0
> ip irdp
> ip irdp preference 400
>
> R1's config:
>
> no ip routing
> in e0
> ip ad 172.16.1.1 255.255.255.0
>
> IRDP is configured on R3 and R4's ethernet 0. IP routing is turned off on
> R1. So it is acting as a host.
>
> Question: Which router is the default gateway for R1? R3 or R4?
>
> According to the Doc CD:
>
> preference number
> (Optional) Preference value. The allowed range is -231 to 231. The default
> is 0. A higher value increases the router's preference level. You can modify
> a particular router so that it will be the preferred router to which others
> home.
>
> My understanding is that the router with a higher preference valve, i.e. R4
> will win.
>
> However, the following route table on R1 shows the opposite:
>
> r1#sh ip route
> Gateway Using Interval Priority Interface
> 172.55.255.3 IRDP 788 300 Ethernet0/1
> 172.55.255.4 IRDP 900 400 Ethernet0/1
> Default gateway is 172.55.255.3
> Host Gateway Last Use Total Uses Interface
> ICMP redirect cache is empty
>
> Could someone please explain this?
>
> Thanks.
>
> George Zhang
>
>
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