what kind of route is this?

gouki2005

O 10.0.0.4/32 [110/12] via 10.0.9.2, 00:01:20, FastEthernet0/1

a /32? is a loopback address ?

lon21

gouki2005 wrote: »

O 10.0.0.4/32 [110/12] via 10.0.9.2, 00:01:20, FastEthernet0/1

a /32? is a loopback address ?

The route is a OSPF.

If you type the cmd.

show ip route

you would get this

R2#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route


Sorry don't know about the look back

gouki2005

lon21 wrote: »

The route is a OSPF.

If you type the cmd.

show ip route

you would get this

R2#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route


Sorry don't know about the look back

i know is a ospf route but i am talking about the address id is using a /32 mask i never used a /32 address before just /30 and bigger so i want to know why they are using the /32 you cant allocate any address with that mask

mikej412

OSPF: Frequently Asked Questions - Cisco Systems

Q. Why are loopbacks advertised as /32 host routes in OSPF?

A. Loopbacks are considered host routes in OSPF, and they are advertised as /32. For more information, refer to section 9.1 of RFC 2328 . In Cisco IOS Software Releases 11.3T and 12.0, if the ip ospf network point-to-point command is configured under loopbacks, OSPF advertises the loopback subnet as the actual subnet configured on loopbacks. ISDN dialer interface advertises /32 subnet instead of its configured subnet mask. This is an expected behavior if ip ospf network point-to-multipoint is configured.

It's also possible to have a /32 peer neighbor route with PPP -- which is the default behavior of PPP encapsulated interfaces on Cisco routers..

Ron Brandt

gouki2005 wrote: »

O 10.0.0.4/32 [110/12] via 10.0.9.2, 00:01:20, FastEthernet0/1

a /32? is a loopback address ?

/32 netmask 255.255.255.255 Single IP address

gouki2005

oh i see thx i need restudy ospf i am forgetting lots of details