From: Simon Baxter (Simon.Baxter@xxxxxxxxxxxxxx)
Date: Wed Aug 23 2000 - 20:42:35 GMT-3
No, the no neighbor-route command won't effect that. PPP does a weird thing
- ie
RTRA
int s0
encap ppp
ip add 150.3.99.1 255.255.255.0
When the interface comes up 2 connected routes will be installed in the
route table :
150.3.99.0/24 and 150.3.99.1/32
on an HDLC interface
RTRB
int s0
encap hd
ip add 150.3.99.1 255.255.255.0
Only one connected route would be added to the route table :
150.3.99.0/24
If OSPF is configured to be looking at this network range (ie netw 0.0.0.0
0.0.0.0 area 0 or 150.3.99.0 0.0.0.255 area 0) then the /32 route would
be added - and OSPF would create an LSA for that new link.
Here's the proof
config:
int s0
ip add 193.1.1.1 255.255.255.0
encap ppp
RTRE#sh ip ro
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
Gateway of last resort is not set
C 193.1.1.0/24 is directly connected, Serial0
C 193.1.1.2/32 is directly connected, Serial0
and now :
config:
int s0
ip add 193.1.1.1 255.255.255.0
encap hdlc
RTRE#sh ip ro
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
Gateway of last resort is not set
C 193.1.1.0/24 is directly connected, Serial0
since a loopback in can't have encap ppp, the no neighbor-route cmd will
have no effect
-----Original Message-----
From: Varghese Thomas [mailto:vnthomas@hotmail.com]
Sent: Thursday, August 24, 2000 3:10 AM
To: Simon Baxter
Subject: Re: OSPF demand circuit
Hello Simon,
Thanks for the valuable info.
If I have my loop back adress with /32 mask, how doI use the "no
neigbour-route command"
Could u pst some sample config
Tx Rd
----- Original Message -----
From: Simon Baxter <Simon.Baxter@au.logical.com>
To: Muthu <muthumon@usa.net>; <ccielab@groupstudy.com>
Sent: Wednesday, August 23, 2000 2:18 AM
Subject: RE: OSPF demand circuit
> No, only on one side. When you've configured it you can do a show ip os
int
> at both ends and you'll see it's configd as DEMAND CIRCUIT.
>
>
> watch the link state for the ppp host route too - I haven't tried it yet
but
> I know that when ppp comes up a /32 route is installed in the route table
as
> well as the route for the interface. This generates an LSA. When the ppp
> goes down, the /32 is removed creating another LSA which brings the link
> back up etc etc etc.
>
> use no neighbor-route command to stop this /32 being generated.
>
> I'm not sure whether this occurs on a spoofing interface or not...will try
> in the next few days. If you can try it now, might save me the time!!!
>
>
> cheers,
>
> Simon
>
> -----Original Message-----
> From: Muthu [mailto:muthumon@usa.net]
> Sent: Wednesday, August 23, 2000 11:46 AM
> To: ccielab@groupstudy.com
> Subject: OSPF demand circuit
>
>
> Hi all,
> I am trying some scenarios in ospf demand circuit over isdn.
> Can some body tell me whether "ip ospf demand circuit " command is
> required
> at both side of the ISDN link.
> Any help is greatly appreciated.
>
> Thanks
> muthu
>
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