From: kuldip singh (dipa.singh@gmail.com)
Date: Wed Mar 16 2005 - 19:52:28 GMT-3
IOS version Version 12.2(15)T9
Rack1R2#sh isis data
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
Rack1R2.00-00 * 0x0000006C 0x9F79 459 0/0/0
Rack1R6.00-00 0x00000026 0x2554 776 0/0/0
Rack1R6.02-00 0x00000023 0x8E92 1121 0/0/0
BB1.00-00 0x00000042 0xA9B5 1158 0/0/1
IS-IS Level-2 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
Rack1R2.00-00 * 0x00000086 0xAD85 381 0/0/0
Rack1R3.00-00 0x0000004A 0x1A29 453 0/0/0
Rack1R5.00-00 0x0000002E 0x71B4 461 0/0/0
Rack1R2#
Thanks
On Wed, 16 Mar 2005 17:47:52 -0500, Jongsoo.Kim@intelsat.com
<Jongsoo.Kim@intelsat.com> wrote:
> 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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