From: Stephen Skinner (stephen_ski@hotmail.com)
Date: Mon Jan 05 2004 - 08:12:59 GMT-3
If i may ....
i don`t get it ...
how can
ip address 172.16.111.1 255.255.248.0
have 172.16.104.x in it`s network ....248 mask will mean that every 6 there
is a change of network ..
i.e 6 12 18 ...meaning that with a /21 the first network is .108....
or am i going stark raving bonkers !!!!
>From: "John Underhill" <stepnwlf@magma.ca>
>Reply-To: "John Underhill" <stepnwlf@magma.ca>
>To: "Dmitry Volkov" <dmitry.volkov@rogers.com>, "'CXP Peter'"
><peter@cyscoexpert.com>, <groupstudy@cconlinelabs.com>
>CC: <ccielab@groupstudy.com>
>Subject: Re: Router blew a gasket
>Date: Sun, 4 Jan 2004 15:14:36 -0500
>
>Got it.. think it's just 'study fatigue' on my part, or Seeing Anomalous
>Route Syndrome..
>Thanks
> ----- Original Message -----
> From: Dmitry Volkov
> To: 'CXP Peter'
> Cc: ccielab@groupstudy.com
> Sent: Sunday, January 04, 2004 2:12 PM
> Subject: RE: Router blew a gasket
>
>
> Some comment inline:
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On
> > Behalf Of CXP Peter
> > Sent: Sunday, January 04, 2004 1:59 PM
> > To: ccielab@groupstudy.com
> > Subject: Re: Router blew a gasket
> >
> >
> > IP address 172.16.111.1 255.255.248.0 happens to be on the
> > 172.16.104.0/21
> > subnet and you advertised some addresses from this subnet
>
> Network statement under OSPF doesn't advertise addresses it rather
>specifies
> what interface OSPF is running on
> and OSPF will advertise actual network configured on this interface,
>which
> is /21 in this case.
>
> > with "network
> > 172.16.111.0 0.0.0.7 area 11". So it is very normal to see
> > this route being
> > advertised in OSPF.
> >
> > _____________________________
> > Peter
> > #7247 (R&S, Security, SP)
> > CyscoExpert Corp.
> > 4433 W. Touhy Ave. Suite 410
> > Lincolnwood, IL 60712
> > Phone (847) 674-3392
> > Toll Free (866) CyscoXP (297-2697)
> > Fax (847) 674-2625
> >
> > ----- Original Message -----
> > From: "John Underhill" <stepnwlf@magma.ca>
> > To: <ccielab@groupstudy.com>
> > Sent: Sunday, January 04, 2004 12:36 PM
> > Subject: Router blew a gasket
> >
> >
> > > I was looking through the routing tables and noticed a
> > route I didn't
> > > advertise. This is really strange, because it says loop0 is
> > connected on
> > this
> > > box in the route table, and is advertising it into OSPF,
> > but the loop0
> > address
> > > that is configured is not the same, (not even close), and I never
> > advertised
> > > this network in OSPF. Router has been rebooted and erased
> > since the last
> > > config, but it looks like it's keeping it in memory.. pretty weird..
> > >
> > > 172.16.0.0/16 is variably subnetted, 9 subnets, 5 masks
> > > C 172.16.134.0/24 is directly connected, Serial0.2
> > > O IA 172.16.44.0/29 [110/65] via 172.16.134.4, 00:03:52,
> > Serial0.2
> > > O IA 172.16.22.0/27 [110/65] via 172.16.123.2, 00:03:52,
> > Serial0.1
> > > C 172.16.1.0/24 is directly connected, Serial1
> > > C 172.16.123.0/24 is directly connected, Serial0.1
> > > C 172.16.104.0/21 is directly connected, Loopback0
> > <-- This one --
> > > R1#
> > > !
> > > interface Loopback0
> > > ip address 172.16.111.1 255.255.248.0
> > > no ip directed-broadcast
> > > no ip route-cache
> > > ip ospf network point-to-point
> > >
> > > router ospf 110
> > > area 111 virtual-link 172.16.134.4
> > > network 172.16.111.0 0.0.0.7 area 11
> > > network 172.16.123.0 0.0.0.255 area 0
> > > network 172.16.134.0 0.0.0.255 area 111
> > >
> > > Routing table on another box shows the route..
> > >
> > > C 172.16.122.0/27 is directly connected, Loopback0
> > > C 172.16.22.0/24 is directly connected, Dialer0
> > > C 172.16.22.1/32 is directly connected, Dialer0
> > > C 172.16.123.0/24 is directly connected, Serial0.1
> > > O IA 172.16.104.0/21 [110/65] via 172.16.123.1,
> > 00:01:58, Serial0.1
> > > R2#
> > >
> > >
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