Friday, June 5, 2015

Simple IS-IS Backbone + Stub Area

R1

Route within 49.0002 is advertised as attached to R3 (which is the L2/L1 router to area 49.0002).

Cost to reach 172.18.1.0 is 40 because 20 to reach R3 and R3 reported 20 to reach the subnet.

R1#show ip route isis
     172.18.0.0/24 is subnetted, 2 subnets
i L2    172.18.2.0 [115/40] via 10.0.0.2, Serial1/0
i L2    172.18.1.0 [115/40] via 10.0.0.2, Serial1/0
     10.0.0.0/24 is subnetted, 3 subnets
i L2    10.2.1.0 [115/30] via 10.0.0.2, Serial1/0
i L2    10.1.0.0 [115/20] via 10.0.0.2, Serial1/0
i L2 192.168.1.0/24 [115/20] via 10.0.0.2, Serial1/0
i L2 192.168.2.0/24 [115/20] via 10.0.0.2, Serial1/0
i L2 192.168.100.0/24 [115/30] via 10.0.0.2, Serial1/0
i L2 192.168.101.0/24 [115/30] via 10.0.0.2, Serial1/0


R1#show clns is-neighbors

System Id      Interface   State  Type Priority  Circuit Id         Format
R2             Se1/0       Up     L2   0         00                 Phase V
R1#
R1#show isis topology


IS-IS paths to level-2 routers
System Id            Metric     Next-Hop             Interface   SNPA
R1                   --
R2                   10         R2                   Se1/0       *HDLC*
R3                   20         R2                   Se1/0       *HDLC*
R1#
R1#show isis database

IS-IS Level-2 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R1.00-00            * 0x00000005   0x9AF7        1046              0/0/0
R2.00-00              0x00000007   0xD37C        881               0/0/0
R3.00-00              0x00000007   0xD024        817               0/0/0
R1#

R1#show isis database detail

IS-IS Level-2 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R1.00-00            * 0x00000005   0x9AF7        1040              0/0/0
  Area Address: 49.0001
  NLPID:        0xCC
  Hostname: R1
  IP Address:   172.17.1.1
  Metric: 10         IS R2.00
  Metric: 10         IP 10.0.0.0 255.255.255.0
  Metric: 10         IP 172.17.1.0 255.255.255.0
  Metric: 10         IP 172.17.2.0 255.255.255.0
R2.00-00              0x00000007   0xD37C        875               0/0/0
  Area Address: 49.0001
  NLPID:        0xCC
  Hostname: R2
  IP Address:   192.168.1.1
  Metric: 10         IS R1.00
  Metric: 10         IS R3.00
  Metric: 10         IP 10.0.0.0 255.255.255.0
  Metric: 10         IP 10.1.0.0 255.255.255.0
  Metric: 10         IP 192.168.1.0 255.255.255.0
  Metric: 10         IP 192.168.2.0 255.255.255.0
R3.00-00              0x00000007   0xD024        809               0/0/0
  Area Address: 49.0002
  NLPID:        0xCC
  Hostname: R3
  IP Address:   192.168.100.1
  Metric: 10         IS R2.00
  Metric: 10         IP 10.1.0.0 255.255.255.0
  Metric: 10         IP 10.2.1.0 255.255.255.0
  Metric: 20         IP 172.18.1.0 255.255.255.0
  Metric: 20         IP 172.18.2.0 255.255.255.0
  Metric: 10         IP 192.168.100.0 255.255.255.0
  Metric: 10         IP 192.168.101.0 255.255.255.0
R1#


R2


R2#show ip route isis
     172.17.0.0/24 is subnetted, 2 subnets
i L2    172.17.1.0 [115/20] via 10.0.0.1, Serial1/0
i L2    172.17.2.0 [115/20] via 10.0.0.1, Serial1/0
     172.18.0.0/24 is subnetted, 2 subnets
i L2    172.18.2.0 [115/30] via 10.1.0.2, Serial1/1
i L2    172.18.1.0 [115/30] via 10.1.0.2, Serial1/1
     10.0.0.0/24 is subnetted, 3 subnets
i L2    10.2.1.0 [115/20] via 10.1.0.2, Serial1/1
i L2 192.168.100.0/24 [115/20] via 10.1.0.2, Serial1/1
i L2 192.168.101.0/24 [115/20] via 10.1.0.2, Serial1/1
R2#

R2#show clns is-neighbors

System Id      Interface   State  Type Priority  Circuit Id         Format
R1             Se1/0       Up     L2   0         00                 Phase V
R3             Se1/1       Up     L2   0         00                 Phase V
R2#
R2#show isis topology


IS-IS paths to level-2 routers
System Id            Metric     Next-Hop             Interface   SNPA
R1                   10         R1                   Se1/0       *HDLC*
R2                   --
R3                   10         R3                   Se1/1       *HDLC*
R2#
R2#show isis database

IS-IS Level-2 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R1.00-00              0x00000005   0x9AF7        834               0/0/0
R2.00-00            * 0x00000007   0xD37C        673               0/0/0
R3.00-00              0x00000007   0xD024        608               0/0/0
R2#
R2#show isis database detail

IS-IS Level-2 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R1.00-00              0x00000005   0x9AF7        829               0/0/0
  Area Address: 49.0001
  NLPID:        0xCC
  Hostname: R1
  IP Address:   172.17.1.1
  Metric: 10         IS R2.00
  Metric: 10         IP 10.0.0.0 255.255.255.0
  Metric: 10         IP 172.17.1.0 255.255.255.0
  Metric: 10         IP 172.17.2.0 255.255.255.0
R2.00-00            * 0x00000007   0xD37C        668               0/0/0
  Area Address: 49.0001
  NLPID:        0xCC
  Hostname: R2
  IP Address:   192.168.1.1
  Metric: 10         IS R1.00
  Metric: 10         IS R3.00
  Metric: 10         IP 10.0.0.0 255.255.255.0
  Metric: 10         IP 10.1.0.0 255.255.255.0
  Metric: 10         IP 192.168.1.0 255.255.255.0
  Metric: 10         IP 192.168.2.0 255.255.255.0
R3.00-00              0x00000007   0xD024        602               0/0/0
  Area Address: 49.0002
  NLPID:        0xCC
  Hostname: R3
  IP Address:   192.168.100.1
  Metric: 10         IS R2.00
  Metric: 10         IP 10.1.0.0 255.255.255.0
  Metric: 10         IP 10.2.1.0 255.255.255.0
  Metric: 20         IP 172.18.1.0 255.255.255.0
  Metric: 20         IP 172.18.2.0 255.255.255.0
  Metric: 10         IP 192.168.100.0 255.255.255.0
  Metric: 10         IP 192.168.101.0 255.255.255.0
R2#


R3

R3#show ip route isis
     172.17.0.0/24 is subnetted, 2 subnets
i L2    172.17.1.0 [115/30] via 10.1.0.1, Serial1/0
i L2    172.17.2.0 [115/30] via 10.1.0.1, Serial1/0
     172.18.0.0/24 is subnetted, 2 subnets
i L1    172.18.2.0 [115/20] via 10.2.1.2, Serial1/1
i L1    172.18.1.0 [115/20] via 10.2.1.2, Serial1/1
     10.0.0.0/24 is subnetted, 3 subnets
i L2    10.0.0.0 [115/20] via 10.1.0.1, Serial1/0
i L2 192.168.1.0/24 [115/20] via 10.1.0.1, Serial1/0
i L2 192.168.2.0/24 [115/20] via 10.1.0.1, Serial1/0
R3#
R3#show clns is-neighbor

System Id      Interface   State  Type Priority  Circuit Id         Format
R4             Se1/1       Up     L1   0         00                 Phase V
R2             Se1/0       Up     L2   0         00                 Phase V
R3#
R3#show isis topology

IS-IS paths to level-1 routers
System Id            Metric     Next-Hop             Interface   SNPA
R3                   --
R4                   10         R4                   Se1/1       *HDLC*

IS-IS paths to level-2 routers
System Id            Metric     Next-Hop             Interface   SNPA
R1                   20         R2                   Se1/0       *HDLC*
R2                   10         R2                   Se1/0       *HDLC*
R3                   --
R3#
R3#show isis database

IS-IS Level-1 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R3.00-00            * 0x00000020   0x3D58        503               1/0/0
R4.00-00              0x00000005   0x780E        518               0/0/0
IS-IS Level-2 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R1.00-00              0x00000005   0x9AF7        743               0/0/0
R2.00-00              0x00000007   0xD37C        583               0/0/0
R3.00-00            * 0x00000007   0xD024        522               0/0/0
R3#
R3#show isis database detail

IS-IS Level-1 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R3.00-00            * 0x00000020   0x3D58        497               1/0/0
  Area Address: 49.0002
  NLPID:        0xCC
  Hostname: R3
  IP Address:   192.168.100.1
  Metric: 10         IP 10.1.0.0 255.255.255.0
  Metric: 10         IP 10.2.1.0 255.255.255.0
  Metric: 10         IP 192.168.100.0 255.255.255.0
  Metric: 10         IP 192.168.101.0 255.255.255.0
  Metric: 10         IS R4.00
R4.00-00              0x00000005   0x780E        511               0/0/0
  Area Address: 49.0002
  NLPID:        0xCC
  Hostname: R4
  IP Address:   172.18.1.1
  Metric: 10         IP 10.2.1.0 255.255.255.0
  Metric: 10         IP 172.18.1.0 255.255.255.0
  Metric: 10         IP 172.18.2.0 255.255.255.0
  Metric: 10         IS R3.00
IS-IS Level-2 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R1.00-00              0x00000005   0x9AF7        735               0/0/0
  Area Address: 49.0001
  NLPID:        0xCC
  Hostname: R1
  IP Address:   172.17.1.1
  Metric: 10         IS R2.00
  Metric: 10         IP 10.0.0.0 255.255.255.0
  Metric: 10         IP 172.17.1.0 255.255.255.0
  Metric: 10         IP 172.17.2.0 255.255.255.0
R2.00-00              0x00000007   0xD37C        574               0/0/0
  Area Address: 49.0001
  NLPID:        0xCC
  Hostname: R2
  IP Address:   192.168.1.1
  Metric: 10         IS R1.00
  Metric: 10         IS R3.00
  Metric: 10         IP 10.0.0.0 255.255.255.0
  Metric: 10         IP 10.1.0.0 255.255.255.0
  Metric: 10         IP 192.168.1.0 255.255.255.0
  Metric: 10         IP 192.168.2.0 255.255.255.0
R3.00-00            * 0x00000007   0xD024        512               0/0/0
  Area Address: 49.0002
  NLPID:        0xCC
  Hostname: R3
  IP Address:   192.168.100.1
  Metric: 10         IS R2.00
  Metric: 10         IP 10.1.0.0 255.255.255.0
  Metric: 10         IP 10.2.1.0 255.255.255.0
  Metric: 20         IP 172.18.1.0 255.255.255.0
  Metric: 20         IP 172.18.2.0 255.255.255.0
  Metric: 10         IP 192.168.100.0 255.255.255.0
  Metric: 10         IP 192.168.101.0 255.255.255.0
R3#
R3#


R4

R4#show ip route isis
     10.0.0.0/24 is subnetted, 2 subnets
i L1    10.1.0.0 [115/20] via 10.2.1.1, Serial1/0
i L1 192.168.100.0/24 [115/20] via 10.2.1.1, Serial1/0
i L1 192.168.101.0/24 [115/20] via 10.2.1.1, Serial1/0
i*L1 0.0.0.0/0 [115/10] via 10.2.1.1, Serial1/0
R4#
R4#show clns is-neighbor

System Id      Interface   State  Type Priority  Circuit Id         Format
R3             Se1/0       Up     L1   0         01                 Phase V
R4#
R4#
R4#show isis topology

IS-IS paths to level-1 routers
System Id            Metric     Next-Hop             Interface   SNPA
R3                   10         R3                   Se1/0       *HDLC*
R4                   --
R4#
R4#show isis database

IS-IS Level-1 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R3.00-00              0x00000020   0x3D58        412               1/0/0
R4.00-00            * 0x00000006   0x760F        1132              0/0/0
R4#
R4#show isis database de
R4#show isis database detail

IS-IS Level-1 Link State Database:
LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
R3.00-00              0x00000020   0x3D58        409               1/0/0
  Area Address: 49.0002
  NLPID:        0xCC
  Hostname: R3
  IP Address:   192.168.100.1
  Metric: 10         IP 10.1.0.0 255.255.255.0
  Metric: 10         IP 10.2.1.0 255.255.255.0
  Metric: 10         IP 192.168.100.0 255.255.255.0
  Metric: 10         IP 192.168.101.0 255.255.255.0
  Metric: 10         IS R4.00
R4.00-00            * 0x00000006   0x760F        1129              0/0/0
  Area Address: 49.0002
  NLPID:        0xCC
  Hostname: R4
  IP Address:   172.18.1.1
  Metric: 10         IP 10.2.1.0 255.255.255.0
  Metric: 10         IP 172.18.1.0 255.255.255.0
  Metric: 10         IP 172.18.2.0 255.255.255.0
  Metric: 10         IS R3.00
R4#