[c-nsp] hsrp and igp

[Phil Mayers]

On Mon, 2007-11-12 at 11:58 +0200, Pavel Gulchouck wrote:
> Hi
> 
> How can I configure HSRP with two routers and track condition
> if I want that IGP (OSPF) always route to active (not standby)
> gateway?

Very difficult. The only realistic solution I have seen is a route map
on the redistribute statement, referencing a prefix-list and increasing
the route metric; and use EEM to dynamically add/delete entries in the
prefix list.

Vile.

> And another issue: can I configure HSRP in which standby router
> routes local segment via active router but not directly?

Similar issue to above.

> 
> I've try following confguration for local segment 10.0.0.0/24
> and virtual gateway 10.0.0.1.
> First router:
> 
> interface gi0/1.100
>   ip address 10.250.0.2 255.255.255.0
>   no ip proxy-arp
>   standby ip 10.250.0.1
>   standby ip 10.0.0.1 secondary
>   standby priority 15
>   standby preempt
>   standby track 1
> ip route 10.0.0.0 255.255.255.0 Gi0/1.100 track 1
> router ospf 100
>   redistribute static subnets metric 20

Ah. Interesting approach.

What is the definition for the track?

> 
> Second router:
> 
> interface gi0/1.100
>   ip address 10.250.0.3 255.255.255.0
>   no ip proxy-arp
>   standby ip 10.250.0.1
>   standby ip 10.0.0.1 secondary
>   standby priority 10
>   standby preempt
> ip route 10.0.0.0 255.255.255.0 Gi0/1.100 111
> router ospf 100
>   redistribute static subnets metric 30
> 
> In this case almost all works good (even for /30 clients networks)
> except of arp. :-( Not all devices replies for request
> "arp who-has 10.0.0.5 tell 10.250.0.2" because of 10.250.0.2 is
> not at local segment for this device.

Correct, that doesn't work reliably. Hmm: "arp source-ip blah" command
is needed.

> 
> Any solution?
> Or any another ideas how can I configure ospf redistribution depends
> of hsrp state or of track condition?

As above: route map/prefix list/event manager.

It would be a lot easier if Cisco provided this functionality natively.
This is an FAQ :o(