From: Olivier Martin (omartin@xxxxxxxx)
Date: Sat Sep 15 2001 - 22:46:12 GMT-3
If you do a show ip ospf interface loopback0, here is a sample of what you
get :
Loopback1 is up, line protocol is up
Internet Address 2.2.2.2/24, Area 0
Process ID 1, Router ID 155.155.155.1, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
The key word is stub host. If you change the network type, using
int loopback1
ip ospf network point-to-point
You will get :
Loopback1 is up, line protocol is up
Internet Address 2.2.2.2/24, Area 0
Process ID 1, Router ID 155.155.155.1, Network Type POINT_TO_POINT, Cost:
1
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:00
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
This way, it's advertised as a /24 if the mask says so.
Hope this helps !
Olivier
-----Message d'origine-----
De : Przemyslaw Karwasiecki [mailto:karwas@ifxcorp.com]
Envoyi : 15 septembre, 2001 21:39
@ : ccielab@groupstudy.com
Objet : Loopbacks in OSPF
Hello,
Does anyone knows why loopbacks are always advertised in OSPF as /32? even
if they are defined as /24 or whatever different then /32
Is there any logical explanation for this phenomenon?
Thanks,
Przemek
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