[c-nsp] ISIS Problem
Ibrahim Abo Zaid
ibrahim.abozaid at gmail.com
Tue Aug 18 09:24:47 EDT 2009
Hi all
To make it clearer , i don't have a problem with default route on R1 i have
a problem with the default route on R2 and R3
best regards
--Ibrahim
On Tue, Aug 18, 2009 at 10:24 AM, Ibrahim Abo Zaid <
ibrahim.abozaid at gmail.com> wrote:
> Hi All
>
> R1 isn't setting ATT bit in its LSP it is like that R1 forwards L1 default
> route to all its L1 neighbors in DEF the originatation area (but it is not
> shown in R1-LSP) , I connected R4 to R1 with L2 ADJ between them and there
> is no DEF route !!
>
> any explainsion ?
>
>
> R1#sh isis database
> IS-IS Level-1 Link State Database:
> LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
>
> R1.00-00 * 0x00000003 0xD80B 1161 0/0/0
> R2.00-00 0x00000003 0xDE59 1165 1/0/0
> R3.00-00 0x00000003 0xDF77 1165 1/0/0
>
> R1#sh isis database R1.00-00 detail
>
> IS-IS Level-1 LSP R1.00-00
>
> LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
>
> R1.00-00 * 0x00000007 0x2B0C 629 0/0/0
> Area Address: 49.0001
> NLPID: 0xCC
> Hostname: R1
> IP Address: 10.10.13.1
> Metric: 10 IP 10.10.12.0/24
> Metric: 10 IP 10.10.13.0/24
> Metric: 10 IS-Extended R3.00
> Metric: 10 IS-Extended R2.00
>
> IS-IS Level-2 LSP R1.00-00
>
> LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
>
> R1.00-00 * 0x00000005 0x6E68 1199 0/0/0
> Area Address: 49.0001
> NLPID: 0xCC
> Hostname: R1
> IP Address: 10.10.13.1
> Metric: 10 IP 10.14.1.0/24
> Metric: 10 IS-Extended R4.01
> Metric: 10 IP 10.10.12.2/32
> Metric: 10 IP 10.10.12.0/24
> Metric: 10 IP 10.10.13.3/32
> Metric: 10 IP 10.10.13.0/24
>
>
>
> R2#sh isis database
> Area 2:
> IS-IS Level-2 Link State Database:
>
> LSPID LSP Seq Num LSP Checksum LSP Holdtime
> ATT/P/OL
>
> R2.00-00 * 0x00000004 0x6D77 1156 0/0/0
> R3.00-00 0x00000004 0x934E 1154 0/0/0
> Area null:
>
> IS-IS Level-1 Link State Database:
> LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
>
> R1.00-00 0x00000003 0xD80B 1143 0/0/0
> R2.00-00 * 0x00000003 0xDE59 1150 1/0/0
> R3.00-00 0x00000003 0xDF77 1147 1/0/0
> R3#sh isis database
> Area 3:
> IS-IS Level-2 Link State Database:
>
> LSPID LSP Seq Num LSP Checksum LSP Holdtime
> ATT/P/OL
>
> R2.00-00 0x00000004 0x6D77 1137 0/0/0
> R3.00-00 * 0x00000004 0x934E 1138 0/0/0
> Area null:
>
> IS-IS Level-1 Link State Database:
> LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
>
> R1.00-00 0x00000003 0xD80B 1125 0/0/0
> R2.00-00 0x00000003 0xDE59 1129 1/0/0
> R3.00-00 * 0x00000003 0xDF77 1132 1/0/0
>
> On Tue, Aug 18, 2009 at 1:51 AM, BRYAN BARTIK <bbartik at uen.org> wrote:
>
>> Hello,
>>
>> Do a "show isis database" and you will see who is setting the ATT bit. R2
>> and R3 are setting the ATT bits and these get flooded to R1 and then across
>> to each other in L1. Probably looks like this:
>>
>> R1#sho isis database
>>
>> IS-IS Level-1 Link State Database:
>> LSPID LSP Seq Num LSP Checksum LSP Holdtime
>> ATT/P/OL
>> R1.00-00 * 0x00000003 0x5524 1173 0/0/0
>> R2.00-00 0x00000003 0x7E42 1161 1/0/0
>> R3.00-00 0x00000003 0xC8F2 1179 1/0/0
>>
>> -Bryan
>>
>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net [mailto:
>> cisco-nsp-bounces at puck.nether.net] On Behalf Of Ibrahim Abo Zaid
>> Sent: Monday, August 17, 2009 2:47 PM
>> To: cisco_nsp; cisco at groupstudy.com
>> Subject: [c-nsp] ISIS Problem
>>
>> Hi All
>>
>> I have a problem with the below ISIS toplogy , All ADJ of R1 are L1 and
>> interface between R2 is in A2 from R2 side and in A3 side from R3 side
>> so R2 and R3 have L2-ADJ betwene them , as expected both R2 and R3 send
>> LSP
>> with ATT bit set so R1 has 2 L1 default routes point to both R2 and R3 ,
>> the
>> wired result there is L1 on both R2 and R3 points to R1 !! but R1 don't
>> set
>> ATT bit in its LSP
>>
>> do you explainsation why R1 sends this default route ? and how we can stop
>> it
>>
>> Topology
>>
>> R2--------L-1------------
>> | |
>> | |
>> L2 A-1 R1
>> | |
>> | |
>> R3---------L-1-----------
>>
>> Configuration
>>
>> R1
>>
>> !
>> interface Serial1/0
>> description to R2
>> ip address 10.10.12.1 255.255.255.0
>> ip router isis
>> encapsulation ppp
>> !
>> interface Serial1/1
>> description to R3
>> ip address 10.10.13.1 255.255.255.0
>> ip router isis
>> encapsulation ppp
>> !
>> router isis
>> net 49.0001.0000.0000.0001.00
>> is-type level-1
>>
>>
>> R2
>>
>> interface Serial1/0
>> description to R1
>> ip address 10.10.12.2 255.255.255.0
>> ip router isis
>> encapsulation ppp
>> !
>> interface Serial1/1
>> description to R3
>> ip address 10.10.23.2 255.255.255.0
>> ip router isis 2
>> encapsulation ppp
>> !
>> router isis 2
>> net 49.0002.0000.0000.0002.00
>> is-type level-2-only
>> !
>> router isis
>> net 49.0001.0000.0000.0002.00
>> is-type level-1
>>
>>
>> R3
>>
>> interface Serial 1/0
>> description to R1
>> ip address 10.10.13.3 255.255.255.0
>> ip router isis
>> encapsulation ppp
>> !
>> interface Serial 1/1
>> description to R2
>> ip address 10.10.23.3 255.255.255.0
>> ip router isis 3
>> encapsulation ppp
>> !
>> router isis 3
>> net 49.0003.0000.0000.0003.00
>> is-type level-2-only
>> !
>> router isis
>> net 49.0001.0000.0000.0003.00
>> is-type level-1
>>
>>
>> Logs
>> -------
>>
>>
>> R1#sh clns neighbors
>> System Id Interface SNPA State Holdtime Type
>> Protocol
>> R2 Se1/0 *PPP* Up 22 L1 IS-IS
>> R3 Se1/1 *PPP* Up 23 L1 IS-IS
>>
>>
>> R2#sh clns neighbors
>> Area 2:
>> System Id Interface SNPA State Holdtime Type
>> Protocol
>> R3 Se1/1 *PPP* Up 28 L2 IS-IS
>> Area null:
>> System Id Interface SNPA State Holdtime Type
>> Protocol
>> R1 Se1/0 *PPP* Up 26 L1 IS-IS
>>
>>
>> R3#sh clns neighbors
>> Area 3:
>> System Id Interface SNPA State Holdtime Type
>> Protocol
>> R2 Se1/1 *PPP* Up 22 L2 IS-IS
>> Area null:
>> System Id Interface SNPA State Holdtime Type
>> Protocol
>> R1 Se1/0 *PPP* Up 28 L1 IS-IS
>>
>> routing tables
>> -----------------
>>
>> R1#sh ip route isis
>> i*L1 0.0.0.0/0 [115/10] via 10.10.13.3, Serial1/1
>> [115/10] via 10.10.12.2, Serial1/0
>>
>> R2#sh ip route isis
>> i L2 10.10.13.1/32 [115/20] via 10.10.23.3, Serial1/0
>> i L1 10.10.13.0/24 [115/20] via 10.10.12.1, Serial1/0
>> i*L1 0.0.0.0/0 [115/20] via 10.10.12.1, Serial1/0
>>
>>
>> R3#sh ip route isis
>> i L1 10.10.12.0/24 [115/20] via 10.10.13.1, Serial1/0
>> i L2 10.10.12.1/32 [115/20] via 10.10.23.2, Serial1/1
>> i*L1 0.0.0.0/0 [115/20] via 10.10.13.1, Serial1/0
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>
>
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