From: Jongsoo.Kim@Intelsat.com
Date: Wed Mar 16 2005 - 19:47:52 GMT-3
Obviously, kwasi mention in his original email that R2 has L1 and L2 routes.
So I assume R2 has other active L2 neighbor somewhere.
I've seen this problem with lower IOS version.
What is your IOS version and can you post the output of "show isis database"
Regards
Jongsoo
-----Original Message-----
From: Andrea Zanetti [mailto:AZanetti@thrupoint.net]
Sent: Wednesday, 16 March, 2005 5:00 PM
To: kwasi-ccie@comcast.net; 'kuldip singh'
Cc: 'Group Study'
Subject: RE: IE LAB2 ISIS
Hi,
I don't have the IE book, and I don't know if this applies to your case,
but during my tests I have noticed that as soon as the L1/L2 router does
not have an L2 connection, it stops injecting the default into level1.
To see it, try this:
Start with:
R1(Net49.0001)L1/L2--level1/2---R2L1/L2(Netadd 49.0001)---level 1
only---R3-L1(NETadd 49.0001)
In this scenario, you should not see a default route on R3.
You will see R1R2 as level1/2 neighs, R2R3 level1 neighs.
If you see the R2L1LSP with the ATT bit, try to do clear isis *.
This will clear the ATT bit. If you don't want to do this, just wait a
bit for the LSP to be updated.
In this situation you should not see the default.
This is what I got in my lab.
Afterwards configure a different netaddress on R1
R1(Net 49.0002 )--level1/2---R2(Netadd 49.0001)---level 1
only---R3(NETadd 49.0001)
You will see R1R2 as level2 neighs, R2R3 level1 neighs.
Now you should see the ATT bit in the R2 LSP and the default route
should appear in R3's routing table.
And this should be permanent.
It seems to me that if and L1/L2 routers does not have a L2 neighs in
another area, will not advert the default.
But it is only a guess...
Any comments will be appreciated :)
Cheers,
Andrea
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
kwasi-ccie@comcast.net
Sent: 16 March 2005 22:25
To: kuldip singh
Cc: Group Study
Subject: Re: IE LAB2 ISIS
I meant R2 has to be a L1/L2 router, since it is connected to R6 which
is L1.
-------------- Original message --------------
> I didn't read your question properly, but for R2 to generate a default
route to
> R6, R2 has to be a L2 router not L1.
>
> -------------- Original message --------------
>
> > Kwaski,
> >
> > That would redistribute level-1-2 routes into R6, but far as I
understood if
> you
> > level-1 router R6 to R2 level-1-2 router, then R2 should generate
default
> route
> > to R6 (Basically R6 should see L1 default route towards R6, so it
can route
> > to all level-2 routes)
> >
> > Thanks
> >
> >
> > On Wed, 16 Mar 2005 20:06:22 +0000, kwasi-ccie@comcast.net
> > wrote:
> > > R6 is L1 router so for it to learn L2 prefixes you have to add
"level-1-2"
> > > on the R2 redistribution statement. Your config should look like:
> > >
> > > R2:
> > > router isis
> > > net 49.0001.0001.0001.0002.00
> > > summary-address 51.0.0.0 255.248.0.0
> > > redistribute ospf 1 level-1-2
> > > passive-interface Loopback0
> > > !
> > >
> > >
> > > -------------- Original message --------------
> > >
> > > > Hi
> > > >
> > > > I have just been doing lab2 in IE and for some reason I just
can't get the
> > > > default route being sent to R6.
> > > >
> > > > R2: is level-1-2 router and Router 6 is level-1 router but using
> > > sub-interface
> > > > on ethernet. If I change R6 to level-1-2 router than I can see
all the
> > > > routes ok on R6. But R6 is configured as Level-1 I can't see the
default.
> > > >
> > > > Any suggestions:
> > > >
> > > > config on R2:
> > > >
> > > > interface Ethernet0/0
> > > > ip address 132.1.26.2 255.255.255.0
> > > > ip router isis
> > > > half-duplex
> > > > isis circuit-type level-1
> > > >
> > > > router isis
> > > > net 49.0001.0001.0001.0002.00
> > > > summary-address 51.0.0.0 255.248.0.0
> > > > redistribute ospf 1
> > > > passive-interface Loopback0
> > > >
> > > >
> > > > R2: has L1 and L2 routes:
> > > >
> > > >
> > > > R6:
> > > > interface Ethernet0.26
> > > > encapsulation dot1Q 26
> > > > ip address 132.1.26.6 255.255.255.0
> > > > ip router isis
> > > >
> > > >
> > > > router isis
> > > > net 49.0001.0001.0001.0006.00
> > > > passive-interface Loopback0
> > > > is-type level-1
> > > >
> > > >
> > > > Routes on R6:
> > > >
> > > > Rack1R6#sh ip route isis
> > > > 51.0.0.0/16 is subnetted, 8 subnets
> > > > i L1 51.3.0.0 [115/10] via 54.1.2.254, ATM0.1
> > > > i L1 51.2.0.0 [115/10] via 54.1.2.254, ATM0.1
> > > > i L1 51.1.0.0 [115/10] via 54.1.2.254, ATM0.1
> > > > i L1 51.0.0.0 [115/10] via 54.1.2.254, ATM0.1
> > > > i L1 51.7.0.0 [115/10] via 54.1.2.254, ATM0.1
> > > > i L1 51.6.0.0 [115/10] via 54.1.2.254, ATM0.1
> > > > i L1 51.5.0.0 [115/10] via 54.1.2.254, ATM0.1
> > > > i L1 51.4.0.0 [115/10] via 54.1.2.254, ATM0.1
> > > > 54.0.0.0/24 is subnetted, 2 subnets
> > > > i L1 54.1.4.0 [115/20] via 54.1.2.254, ATM0.1
> > > > 150.1.0.0/24 is subnetted, 2 subnets
> > > > i L1 150.1.2.0 [115/10] via 132.1.26.2, Ethernet0.26
> > > > Rack1R6#
> > > >
> > > > Rack1R6#sh clns neig
> > > >
> > > > System Id Interface SNPA State Holdtime Type Protocol
> > > > Rack1R2 Et0.26 0030.9436.24e0 Up 26 L1 IS-IS
> > > > BB1 AT0.1 VC 6 Up 27 L1 IS-IS
> > > > Rack1R6#
> > > >
> > > > Appreciate any info Thanks
> > > >
> > > >
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