IS-IS Network Design Solutions (Networking Technology)

Figure A-6. Level-1 complete sequence number packets (PDU Type 24).

Example A-15 Analyzer Capture: Level-1 CSNP

ADDR HEX ASCII 0000: 01 80 c2 00 00 14 00 d0 58 f7 89 41 00 66 fe fe .....DX A.fww 0010: 03 83 21 01 00 18 01 00 00 00 63 00 00 00 00 00 . !.......c..... 0020: 01 00 00 00 00 00 00 00 00 00 ff ff ff ff ff ff .......... 0030: ff ff 09 40 04 a6 00 00 00 00 00 01 00 00 00 00 .@........... 0040: 18 33 f6 c7 04 1b 00 00 00 00 00 01 01 00 00 00 .3............ 0050: 18 13 a5 61 04 a8 00 00 00 00 00 03 00 00 00 00 ..a............ 0060: 28 be 06 12 04 77 00 00 00 00 00 05 00 00 00 00 (p...w.......... 0070: 05 fd ec ab .y

Example A-16 Decode of Example A-15 (Level-1 CSNP Part 1)

DLC: ----- DLC Header ----- DLC: Frame 75 arrived at 18:48:07.8401; frame size is 116 (0074 hex) bytes. DLC: Destination = Multicast 0180C2000014 DLC: Source = Station 00D058F78941 DLC: 802.3 length = 102 LLC: ----- LLC Header ----- LLC: DSAP Address = FE, DSAP IG Bit = 00 (Individual Address) LLC: SSAP Address = FE, SSAP CR Bit = 00 (Command) LLC: Unnumbered frame: UI LLC: IS-IS: ----- ISO Network Layer Header ----- IS-IS: Protocol ID = 83 (Intermediate System Routing Exchange Protocol) IS-IS: Header length = 33 IS-IS: Version / Protocol ID Extension = 1 IS-IS: ID Length = 0, Indicates 6 Octets IS-IS: PDU type = 24 (Complete Sequence Numbers, Level 1) IS-IS: Version = 1 IS-IS: Reserved = 0 IS-IS: Maximum Area Addesses = 0 IS-IS: Frame length is 99 byte(s) IS-IS: Source: IS-IS: ID = 000000000001 IS-IS: Pseudo-node = 00 (Not a pseudo-node) IS-IS: Start Link State ID = 000000000000-00-00 IS-IS: End Link State ID = FFFFFFFFFFFF-FF-FF

Example A-17 Decode of Example A-15 (Level-1 CSNP Part 2)

IS-IS: ----- ISO Network Layer Variable Fields ----- IS-IS: Variable field: IS-IS: Field Code = 9 (Link State Frame Entries) IS-IS: Field length = 64 IS-IS: Link State Frame Data: IS-IS: Remaining Life is 1190 second(s) IS-IS: Link State Frame ID: IS-IS: Source ID = 000000000001 IS-IS: Pseudo-node = 00 (Not a pseudo-node) IS-IS: Link frame no. = 0 IS-IS: Frame Sequence = 6195 IS-IS: Checksum = F6C7 IS-IS: Link State Frame Data: IS-IS: Remaining Life is 1051 second(s) IS-IS: Link State Frame ID: IS-IS: Source ID = 000000000001 IS-IS: Pseudo-node = 01 IS-IS: Link frame no. = 0 IS-IS: Frame Sequence = 6163 IS-IS: Checksum = A561 IS-IS: Link State Frame Data: IS-IS: Remaining Life is 1192 second(s) IS-IS: Link State Frame ID: IS-IS: Source ID = 000000000003 IS-IS: Pseudo-node = 00 (Not a pseudo-node) IS-IS: Link frame no. = 0 IS-IS: Frame Sequence = 10430 IS-IS: Checksum = 0612 [snip]

Example A-18 Analyzer Capture: Level-1 PSNP

ADDR HEX ASCII 0000: 01 80 c2 00 00 14 00 d0 58 eb f8 41 00 56 fe fe .....DXA.Vww 0010: 03 83 11 01 00 1a 01 00 00 00 53 00 00 00 00 00 . ........S..... 0020: 03 00 09 40 04 af 00 00 00 00 00 01 00 00 00 00 ...@.-.......... 0030: 00 00 00 00 04 af 00 00 00 00 00 01 01 00 00 00 .....-.......... 0040: 00 00 00 00 04 aa 00 00 00 00 00 03 00 00 00 00 ............... 0050: 00 02 ed 19 04 af 00 00 00 00 00 05 00 00 00 00 ....-.......... 0060: 00 00 00 00 ....

Example A-19 Decode of Example A-18 (Level-1 PSNP Part 1)

DLC: ----- DLC Header ----- DLC: DLC: Frame 103 arrived at 19:04:39.3473; frame size is 100 (0064 hex) bytes. DLC: Destination = Multicast 0180C2000014 DLC: Source = Station 00D058EBF841 DLC: 802.3 length = 86 DLC: LLC: ----- LLC Header ----- LLC: LLC: DSAP Address = FE, DSAP IG Bit = 00 (Individual Address) LLC: SSAP Address = FE, SSAP CR Bit = 00 (Command) LLC: Unnumbered frame: UI LLC: IS-IS: ----- ISO Network Layer Header ----- IS-IS: IS-IS: Protocol ID = 83 (Intermediate System Routing Exchange Protocol) IS-IS: Header length = 17 IS-IS: Version / Protocol ID Extension = 1 IS-IS: ID Length = 0, Indicates 6 Octets IS-IS: PDU type = 26 (Partial Sequence Numbers, Level 1) IS-IS: Version = 1 IS-IS: Reserved = 0 IS-IS: Maximum Area Addesses = 0 IS-IS: Frame length is 83 byte(s) IS-IS: Source: IS-IS: ID = 000000000003 IS-IS: Pseudo-node = 00 (Not a pseudo-node)

Example A-20 Decode of Example A-18 (Level-1 PSNP Part 2)

IS-IS: ----- ISO Network Layer Variable Fields ----- IS-IS: IS-IS: Variable field: IS-IS: Field Code = 9 (Link State Frame Entries) IS-IS: Field length = 64 IS-IS: Link State Frame Data: IS-IS: Remaining Life is 1199 second(s) IS-IS: Link State Frame ID: IS-IS: Source ID = 000000000001 IS-IS: Pseudo-node = 00 (Not a pseudo-node) IS-IS: Link frame no. = 0 IS-IS: Frame Sequence = 0 IS-IS: Checksum = 0000 (No checksum sent) IS-IS: Link State Frame Data: IS-IS: Remaining Life is 1199 second(s) IS-IS: Link State Frame ID: IS-IS: Source ID = 000000000001 IS-IS: Pseudo-node = 01 IS-IS: Link frame no. = 0 IS-IS: Frame Sequence = 0 IS-IS: Checksum = 0000 (No checksum sent)- IS-IS: Link State Frame Data: IS-IS: Remaining Life is 1194 second(s) IS-IS: Link State Frame ID: IS-IS: Source ID = 000000000003 IS-IS: Pseudo-node = 00 (Not a pseudo-node) IS-IS: Link frame no. = 0 IS-IS: Frame Sequence = 2 IS-IS: Checksum = ED19