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IS-IS                   PART 1                                                                                 packetlife.net
                               Protocol Header                                                        Attributes
                   4                      8                   12                  16                 Type Link-State
                  IRPD                                    Packet Length
                                                                                               Algorithm Dijkstra
     Version/Protocol ID Extension                          ID Length
                                                                                                   Metric Default (10)
 R     R    R           PDU Type                             Version
                                                                                                       AD 115
                Reserved                           Maximum Area Addresses
                                                                                                Standard ISO 10589
                  Type                                       Length
                                                                                                Protocols IP, CLNS
                                       Value ...
                                                                                               Transport Layer 2

                               NSAP Addressing                                           Authentication Plaintext, MD5

                       Interdomain Part               Domain-Specific Part                         Routing Levels
                                                                                        Level 0 Used to locate end systems
        NSAP     AFI             IDI               HODSP
                                                              System ID      SEL        Level 1 Routing within an area
Condensed                         Area
                                                                                        Level 2 Backbone between areas
     Example      47     0005.80ff.f800.0000       0001     0000.0c00.1234   00
                                                                                        Level 3 Inter-AS routing

Interdomain Part (IDP)                                                                               Terminology
Portion of the address used in routing between autonomous
                                                                                       Type-Length-Value (TLV)
systems; assigned by ISO
                                                                                       Variable-length modular datasets
Domain-Specific Part (DSP)
                                                                                       Link State PDU (LSP)
Portion of the address relevant only within the local AS
                                                                                       Carry TLVs encompassing link state
Authority and Format Identifier (AFI)                                                  information
Identifies the authority which dictates the format of the address                      Sequence Number Packet (SNP)
                                                                                       Used to request and advertise LSPs; can
Initial Domain Identifier (IDI)
                                                                                       be complete (CSNP) or partial (PSNP)
An organization belonging to the AFI
                                                                                       Hello Packet
High Order DSP (HODSP)                                                                 Establishes and maintains neighbor
The area within the AS                                                                 adjacencies
System ID                                                                              Designated Intermediate System
Unique router identifier; 48 bits for Cisco devices (often taken from                  A pseudonode responsible for emulating
a MAC address)                                                                         point-to-point links across a multi-access
NSAP Selector (SEL)                                                                    segment
Identifies a network layer service; always 0x00 in a NET address
                                                                                             Adjacency Requirements
                                Network Types                                           Interface MTUs must match
                                Broadcast                   Point-to-Point              Levels must match
                DIS Elected Yes                             No                          Areas must match (if level 1)
     Neighbor Discovery Yes                                 Yes                         System IDs must be unique
     Hello/Dead Timers 10/30                                10/30                       Authentication must succeed
                               Troubleshooting                                                       DIS Election
show ip route                            show isis spf-log                              Highest-priority interface elected
show ip protocols                        debug isis spf-events                          Highest SNPA (MAC/DLCI) breaks tie
show [clns|isis] neighbor                debug isis adjacencies-packets                 Highest system ID breaks SNPA tie
show [clns|isis] interface               debug isis spf-statistics                      Default interface priority is 64
show isis database                       debug isis update-packets                      Current DIS may be preempted

by Jeremy Stretch                                                                                                            v2.0
IS-IS                 PART 2                                                                                           packetlife.net
                                                                           TLV Types
  Name                        Use                        Name                 Use                  Name                   Use

1 Area Addresses              Hello, LSP              6 IS Neighbors          Hello, L2 LSP   128 IP Internal Reach.      LSP
2 IS Neighbors                LSP                     8 Padding               Hello           129 Protocols Supported     Hello, LSP
3 ES Neighbors                L1 LSP                  9 LSP Entries           SNP             131 IDRPI                   SNP, L2 LSP
5 Prefix Neighbors            L2 LSP             10 Authentication All                        132 IP Interface Address    Hello, LSP

                                                               Configuration Example

                                   Area 1                                                                                       Router A2
                              192.168.1.0/24                                     interface FastEthernet0/0
                                                                                  description Area 1
                                                                                  ip address 192.168.1.2 255.255.255.0
                                         A3                                       ip router isis
                              A2                                                  isis circuit-type level-1
                                                                                 !
                                                                                 router isis
                                    A1                                            net 49.0001.0000.0000.00a2.00
                                            10
                             0
                           /3




                                              .0




                                                                                                                                Router B2
                         .0




                                                 .0




      Area 2                                                  Area 3
                          0




                                                .4/




                                                                                 interface FastEthernet0/0
                       .0.




    192.168.2.0/24                                        192.168.3.0/24
                     10




                                                    30




                                                                                  description Area 2
                                                                                  ip address 192.168.2.2 255.255.255.0
                                                                                  ip router isis
    B2                                                                C2          isis circuit-type level-1
                                10.0.0.8/30                                      !
               B1                                        C1                      router isis
      B3                                                                          net 49.0002.0000.0000.00b2.00
                                                                C3


                                                                     Router A1                                                  Router B1
interface FastEthernet0/0                                                        interface FastEthernet0/0
 description Area 1                                                               description Area 2
 ip address 192.168.1.1 255.255.255.0                                             ip address 192.168.2.1 255.255.255.0
 ip router isis                                                                   ip router isis
 isis circuit-type level-1                                                        isis circuit-type level-1
!                                                                                !
interface Serial1/0                                                              interface Serial1/0
 no ip address                                                                    no ip address
 encapsulation frame-relay                                                        encapsulation frame-relay
!                                                                                !
interface Serial1/0.1 point-to-point                                             interface Serial1/0.1 point-to-point
 description To Area 2                                                            description To Area 1
 ip address 10.0.0.1 255.255.255.252                                              ip address 10.0.0.2 255.255.255.252
 ip router isis                                                                   ip router isis
 isis circuit-type level-2-only                                                   isis circuit-type level-2-only
! MD5 authentication (keychain not shown)                                        ! MD5 authentication (keychain not shown)
 isis authentication mode md5                                                     isis authentication mode md5
 isis authentication key-chain <keychain>                                         isis authentication key-chain <keychain>
 frame-relay interface-dlci 101                                                   frame-relay interface-dlci 101
!                                                                                !
interface Serial1/0.2 point-to-point                                             interface Serial1/0.2 point-to-point
 description To Area 3                                                            description To Area 3
 ip address 10.0.0.5 255.255.255.252                                              ip address 10.0.0.9 255.255.255.252
 ip router isis                                                                   ip router isis
 isis circuit-type level-2-only                                                   isis circuit-type level-2-only
 frame-relay interface-dlci 102                                                   frame-relay interface-dlci 103
!                                                                                !
router isis                                                                      router isis
 net 49.0001.0000.0000.00a1.00                                                    net 49.0002.0000.0000.00b1.00

by Jeremy Stretch                                                                                                                   v2.0

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Is is

  • 1. IS-IS PART 1 packetlife.net Protocol Header Attributes 4 8 12 16 Type Link-State IRPD Packet Length Algorithm Dijkstra Version/Protocol ID Extension ID Length Metric Default (10) R R R PDU Type Version AD 115 Reserved Maximum Area Addresses Standard ISO 10589 Type Length Protocols IP, CLNS Value ... Transport Layer 2 NSAP Addressing Authentication Plaintext, MD5 Interdomain Part Domain-Specific Part Routing Levels Level 0 Used to locate end systems NSAP AFI IDI HODSP System ID SEL Level 1 Routing within an area Condensed Area Level 2 Backbone between areas Example 47 0005.80ff.f800.0000 0001 0000.0c00.1234 00 Level 3 Inter-AS routing Interdomain Part (IDP) Terminology Portion of the address used in routing between autonomous Type-Length-Value (TLV) systems; assigned by ISO Variable-length modular datasets Domain-Specific Part (DSP) Link State PDU (LSP) Portion of the address relevant only within the local AS Carry TLVs encompassing link state Authority and Format Identifier (AFI) information Identifies the authority which dictates the format of the address Sequence Number Packet (SNP) Used to request and advertise LSPs; can Initial Domain Identifier (IDI) be complete (CSNP) or partial (PSNP) An organization belonging to the AFI Hello Packet High Order DSP (HODSP) Establishes and maintains neighbor The area within the AS adjacencies System ID Designated Intermediate System Unique router identifier; 48 bits for Cisco devices (often taken from A pseudonode responsible for emulating a MAC address) point-to-point links across a multi-access NSAP Selector (SEL) segment Identifies a network layer service; always 0x00 in a NET address Adjacency Requirements Network Types Interface MTUs must match Broadcast Point-to-Point Levels must match DIS Elected Yes No Areas must match (if level 1) Neighbor Discovery Yes Yes System IDs must be unique Hello/Dead Timers 10/30 10/30 Authentication must succeed Troubleshooting DIS Election show ip route show isis spf-log Highest-priority interface elected show ip protocols debug isis spf-events Highest SNPA (MAC/DLCI) breaks tie show [clns|isis] neighbor debug isis adjacencies-packets Highest system ID breaks SNPA tie show [clns|isis] interface debug isis spf-statistics Default interface priority is 64 show isis database debug isis update-packets Current DIS may be preempted by Jeremy Stretch v2.0
  • 2. IS-IS PART 2 packetlife.net TLV Types Name Use Name Use Name Use 1 Area Addresses Hello, LSP 6 IS Neighbors Hello, L2 LSP 128 IP Internal Reach. LSP 2 IS Neighbors LSP 8 Padding Hello 129 Protocols Supported Hello, LSP 3 ES Neighbors L1 LSP 9 LSP Entries SNP 131 IDRPI SNP, L2 LSP 5 Prefix Neighbors L2 LSP 10 Authentication All 132 IP Interface Address Hello, LSP Configuration Example Area 1 Router A2 192.168.1.0/24 interface FastEthernet0/0 description Area 1 ip address 192.168.1.2 255.255.255.0 A3 ip router isis A2 isis circuit-type level-1 ! router isis A1 net 49.0001.0000.0000.00a2.00 10 0 /3 .0 Router B2 .0 .0 Area 2 Area 3 0 .4/ interface FastEthernet0/0 .0. 192.168.2.0/24 192.168.3.0/24 10 30 description Area 2 ip address 192.168.2.2 255.255.255.0 ip router isis B2 C2 isis circuit-type level-1 10.0.0.8/30 ! B1 C1 router isis B3 net 49.0002.0000.0000.00b2.00 C3 Router A1 Router B1 interface FastEthernet0/0 interface FastEthernet0/0 description Area 1 description Area 2 ip address 192.168.1.1 255.255.255.0 ip address 192.168.2.1 255.255.255.0 ip router isis ip router isis isis circuit-type level-1 isis circuit-type level-1 ! ! interface Serial1/0 interface Serial1/0 no ip address no ip address encapsulation frame-relay encapsulation frame-relay ! ! interface Serial1/0.1 point-to-point interface Serial1/0.1 point-to-point description To Area 2 description To Area 1 ip address 10.0.0.1 255.255.255.252 ip address 10.0.0.2 255.255.255.252 ip router isis ip router isis isis circuit-type level-2-only isis circuit-type level-2-only ! MD5 authentication (keychain not shown) ! MD5 authentication (keychain not shown) isis authentication mode md5 isis authentication mode md5 isis authentication key-chain <keychain> isis authentication key-chain <keychain> frame-relay interface-dlci 101 frame-relay interface-dlci 101 ! ! interface Serial1/0.2 point-to-point interface Serial1/0.2 point-to-point description To Area 3 description To Area 3 ip address 10.0.0.5 255.255.255.252 ip address 10.0.0.9 255.255.255.252 ip router isis ip router isis isis circuit-type level-2-only isis circuit-type level-2-only frame-relay interface-dlci 102 frame-relay interface-dlci 103 ! ! router isis router isis net 49.0001.0000.0000.00a1.00 net 49.0002.0000.0000.00b1.00 by Jeremy Stretch v2.0