From: Fred Ingham (fningham@xxxxxxxxxxxxxxxx)
Date: Wed Dec 06 2000 - 17:35:11 GMT-3
If you configure a router as a host you can use the ip gdp irdp
command to check it out. However be aware that the cisco gdp
prefers the lowest preference not the highest preference per the rfc.
If configuring IRDP without a host using gdp configure the preferred
router with the highest preference.
Below is an exercise used in the ECP1 course:
· Configure Frame Relay switch as a host and place it on the VLAN X3
(VLAN X3 connects R3 and R4)
· Configure R3 and R4 to advertise them selves as gateways on the VLAN
X3 using ICMP protocol every 20 sec.
· Make sure FRS uses R4 as a default gateway.
R3
interface Ethernet0
ip address 172.16.20.3 255.255.255.0
no ip directed-broadcast
ip irdp
ip irdp maxadvertinterval 20
ip irdp minadvertinterval 15
ip irdp preference 100
R4
interface Ethernet0
ip address 172.16.20.4 255.255.255.0
no ip directed-broadcast
ip irdp
ip irdp maxadvertinterval 20
ip irdp minadvertinterval 15
ip irdp preference 1
FRS
no ip routing
interface Ethernet0
ip address 172.16.20.7 255.255.255.0
ip directed-broadcast
no ip proxy-arp
no ip route-cache
no ip mroute-cache
ip gdp irdp
commands: sh ip route, deb ip icmp, deb arp.
Lowest priority is preferred ( RFC is highest)
HTH, Fred.
Robert DeVito wrote:
>
> I have a simple question about IRDP. If I am configuring a router to
> automatically send out a default gateway (assuming the clients support
> it), would I use the "ip irdp multicast" command?
>
> or would I just do the following: ?
>
> ip irdp
> ip irdp preference 600 (optional)
>
> Does anyone have a clean sample config of IRDP, I can not find
> anything on CCO???
>
>
> Thank you,
> Robert DeVito
>
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