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OSPF routing Loop

 
 
Cuang-liang Dai
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      02-07-2004
Dear all:
I meet a problem. In our network, we use netmask /22 bit, Cisco 6513 ,OSPF.

I don't know why it always has a 24 bit subnet routing entry in all router to cover my setup. i.e, I use 10.34.116.0/22 in 6513 Native IOS router, but it always be coverd from that router having a 10.34.116.0/24 subnet.

The 10.34.117.0, 10.34.118.0, 10.34.119.0 segment is ok, 10.34.116.0 is fail. it run under loop , We check that all router, without 10.34.116.0/24 subnet.
But it always exist and replace my local config and static route.

What is the happen ? How to clear that bad entry ?
 
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Bob Sinclair
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      02-08-2004
Pardon me if I do not understand your problem, but...

You say that you use a /22 mask, but the 117, 118 and 119 subnets must be
using a /24 mask. 116/22 is a summary for 116/24, 117/24, 118/24 and
119/24.

Can you give more details?

--
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net

"Cuang-liang Dai" <(E-Mail Removed)> wrote in message
news:c03spf$2sk7$(E-Mail Removed)...
> Dear all:
> I meet a problem. In our network, we use netmask /22 bit, Cisco 6513

,OSPF.
>
> I don't know why it always has a 24 bit subnet routing entry in all router

to cover my setup. i.e, I use 10.34.116.0/22 in 6513 Native IOS router, but
it always be coverd from that router having a 10.34.116.0/24 subnet.
>
> The 10.34.117.0, 10.34.118.0, 10.34.119.0 segment is ok, 10.34.116.0 is

fail. it run under loop , We check that all router, without 10.34.116.0/24
subnet.
> But it always exist and replace my local config and static route.
>
> What is the happen ? How to clear that bad entry ?



 
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micke
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Posts: n/a
 
      02-10-2004
hey should not the virtual-link be to or from router B and NOT A to
the backbone router

All routers that interconnect areas has to be a part of backbone

/micke

"Bob Sinclair" <(E-Mail Removed)> wrote in message news:<5qsVb.2982$Yj.2449@lakeread02>...
> Pardon me if I do not understand your problem, but...
>
> You say that you use a /22 mask, but the 117, 118 and 119 subnets must be
> using a /24 mask. 116/22 is a summary for 116/24, 117/24, 118/24 and
> 119/24.
>
> Can you give more details?
>
> --
> Bob Sinclair
> CCIE #10427, CISSP, MCSE
> www.netmasterclass.net
>
> "Cuang-liang Dai" <(E-Mail Removed)> wrote in message
> news:c03spf$2sk7$(E-Mail Removed)...
> > Dear all:
> > I meet a problem. In our network, we use netmask /22 bit, Cisco 6513

> ,OSPF.
> >
> > I don't know why it always has a 24 bit subnet routing entry in all router

> to cover my setup. i.e, I use 10.34.116.0/22 in 6513 Native IOS router, but
> it always be coverd from that router having a 10.34.116.0/24 subnet.
> >
> > The 10.34.117.0, 10.34.118.0, 10.34.119.0 segment is ok, 10.34.116.0 is

> fail. it run under loop , We check that all router, without 10.34.116.0/24
> subnet.
> > But it always exist and replace my local config and static route.
> >
> > What is the happen ? How to clear that bad entry ?

 
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