Hello Christ!
If every router adv the loopback subnet though OSPF. Then you can ping to them.
A proper static router also can help you to reach the loopback subnet in another
router.
Cisco router dose not allow you to put two interface in same subnet.
When I work out the IP addressing plan. I usually reserve a subnet for loopback
address.
And all loopback address will draw from this subnet, with a 32 bit subnet mask.
In some case. Loopback address may reach by proxy ARP.
eg :
Router A -- 172.100.1.254, use 24 bit subnet mask.
All router's LAN interface use 172.100.1.128/25, default route to 172.100.1.254
All router's loopback use 172.100.1.1 - 172.100.1.254 /32
If you ping from to other loopback address from your router. It will consider as
different subnet, and consult Router A.
Router A consider the desination address as same subnet. It send out ARP request to
locate the loopback you want.
If a router have the loopback inside it. This router will response to this ARP request.
This is know as Proxy ARP. On Cisco platform, Proxy ARP is enabled by default.
Finally you can ping to the loopback address you want.
Enjoy!!
Quncy Lau
CCNP
Hong Kong
Christopher Larson wrote:
> If all the interfaces in say area 0 are 170.100.1.0 /24 and my loopbacks
> are 2.2.2.0/24, should I be able to ping each loopback from all the
> other routers? or do I need to make my loopbacks a subnet of the
> 170.100.1.0/24 address??
>
> Thanx!!
>
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