ISIS: default route to L1 routers

From: A Paradela (aparadela@earthlink.net)
Date: Wed Sep 24 2003 - 18:17:49 GMT-3


Not able to make this work. Any thoughts / hints appreciated.

R2 -- (L2) -- R5 -- (L1) -- R6

R2 advertising 133.9.2.0/24 and 133.8.0.0/16 (summary)
R5 advertising 133.9.5.0/24
R6 advertising 133.9.6.0/24

Should R6's routing table should have a 0.0.0.0/0 route to R5? It does not.
CLNS routing enabled on all interfaces, all adjacencies are up.
R2 and R5 sharing all routes just fine.
From "sh isis database" R2's L1 ATT bit to self is set, no other ATT bits are set (would expect one on R5)

R6 only sees an L1 route from R5 (loopback0)

Also tried default-information-originate on R5 (is it necessary??) but only R2 sees it, not R6.
How can the 0.0.0.0/0 route be made to only advertise to L1 peers?

Running 12.2.16b.

Thanks, AP

!R6
clns routing
interface Ethernet0
 ip address 133.9.50.5 255.255.255.0
 ip router isis
 clns router isis
 isis circuit-type level-1
router isis
 net 65.1111.6666.6666.6666.00
 passive-interface Loopback0
 is-type level-1

     133.9.0.0/24 is subnetted, 4 subnets
i L1 133.9.5.0 [115/10] via 133.9.50.1, Ethernet0

!R5
clns routing
interface Ethernet0
 ip address 133.9.50.1 255.255.255.0
 ip router isis
 clns router isis
 isis circuit-type level-1
interface Serial1
 ip address 133.9.101.2 255.255.255.0
 ip router isis
 encapsulation frame-relay
 no fair-queue
 frame-relay map clns 502 broadcast
 frame-relay map ip 133.9.101.1 502 broadcast
 frame-relay map ip 133.9.101.2 502
 frame-relay map ip 133.9.101.5 502 broadcast
 no frame-relay inverse-arp
 clns router isis
 isis circuit-type level-2-only
router isis
 net 65.1111.5555.5555.5555.00
 passive-interface Loopback0
 default-information originate
 never-set-attached-bit <<-- ?? not sure where this came from, can't find documentation on it...

i L2 133.8.0.0/16 [115/20] via 133.9.101.1, Serial1
     133.9.0.0/24 is subnetted, 5 subnets
i L1 133.9.6.0 [115/10] via 133.9.50.5, Ethernet0
i L2 133.9.2.0 [115/10] via 133.9.101.1, Serial1

IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
5555.5555.5555.00-00* 0x0000000D 0x12D1 1026 0/0/0
  Area Address: 65.1111
  NLPID: 0x81 0xCC
  IP Address: 133.9.5.5
  Metric: 10 IP 133.9.50.0 255.255.255.0
  Metric: 0 IP 133.9.5.0 255.255.255.0
  Metric: 10 IS 6666.6666.6666.01
  Metric: 0 ES 5555.5555.5555
6666.6666.6666.00-00 0x0000000C 0xBF57 1024 0/0/0
  Area Address: 65.1111
  NLPID: 0x81 0xCC
  IP Address: 133.9.6.6
  Metric: 10 IP 133.9.50.0 255.255.255.0
  Metric: 0 IP 133.9.6.0 255.255.255.0
  Metric: 10 IS 6666.6666.6666.01
  Metric: 0 ES 6666.6666.6666
6666.6666.6666.01-00 0x00000005 0xB5D1 1023 0/0/0
  Metric: 0 IS 6666.6666.6666.00
  Metric: 0 IS 5555.5555.5555.00
IS-IS Level-2 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
2222.2222.2222.00-00 0x00000011 0x4B4E 1003 0/0/0
  Area Address: 02.1111
  NLPID: 0x81 0xCC
  IP Address: 133.9.2.2
  Metric: 10 IP 133.9.101.0 255.255.255.0
  Metric: 10 IS 5555.5555.5555.03
  Metric: 0 IP 133.9.2.0 255.255.255.0
  Metric: 10 IP 133.8.0.0 255.255.0.0
5555.5555.5555.00-00* 0x0000000C 0x34DD 1025 0/0/0
  Area Address: 65.1111
  NLPID: 0x81 0xCC
  IP Address: 133.9.5.5
  Metric: 10 IP 133.9.101.0 255.255.255.0
  Metric: 10 IS 5555.5555.5555.03
  Metric: 0 IP 0.0.0.0 0.0.0.0
  Metric: 0 IP 133.9.5.0 255.255.255.0
  Metric: 10 IP 133.9.6.0 255.255.255.0
  Metric: 10 IP 133.9.50.0 255.255.255.0
5555.5555.5555.03-00* 0x00000005 0xD239 519 0/0/0
  Metric: 0 IS 5555.5555.5555.00
  Metric: 0 IS 2222.2222.2222.00

!R2
interface Serial1
 no ip address
 encapsulation frame-relay
 no fair-queue
 clockrate 2000000
 no frame-relay inverse-arp
interface Serial1.256 multipoint
 ip address 133.9.101.1 255.255.255.0
 ip router isis
 frame-relay map clns 205 broadcast
 frame-relay map ip 133.9.101.1 205
 frame-relay map ip 133.9.101.2 205 broadcast
 frame-relay map ip 133.9.101.5 206 broadcast
 clns router isis
 isis circuit-type level-2-only
router isis
 net 02.1111.2222.2222.2222.00
 passive-interface Loopback0

     133.8.0.0/16 is variably subnetted, 2 subnets, 2 masks
i su 133.8.0.0/16 [115/10] via 0.0.0.0, Null0
     133.9.0.0/16 is variably subnetted, 7 subnets, 2 masks
i L2 133.9.5.0/24 [115/10] via 133.9.101.2, Serial1.256
i L2 133.9.6.0/24 [115/20] via 133.9.101.2, Serial1.256
i L2 133.9.50.0/24 [115/20] via 133.9.101.2, Serial1.256
i*L2 0.0.0.0/0 [115/10] via 133.9.101.2, Serial1.256

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