IS-IS - Intermediate System to Intermediate System
    • is-is เหมาะสำหรับ เครือข่ายขนาดใหญ่ อย่างพวก isp ขึ้นไป แต่มันใช้ยาก เมืองไทยจึงใช้ ospf กันมาก มากขึ้นๆ จากเล็กๆ เป็นเครือข่าย
      www2.thaiadmin.org/board/index.php?topic=37492

    What is IS-IS ?, IS-IS History and Background, IS-IS Designs, OSPF vs IS-IS, Understanding
    http://www.nemako.net/dc2/?post/ISIS


    Configuring Integrated IS-IS, IS-IS Configuration Task List, Enable IS-IS, Configure IS-IS Interface Parameters, Miscellaneous IS-IS
    http://www.cisco.com/en/US/docs/ios/11_3/np1/configuration/guide/1cisis.html


    Network entity title (NET), NSAP Address
    http://www.ciscoclub.in.th/index.php?topic=961


    IS-IS Terminology
    http://sites.google.com/site/amitsciscozone/home/is-is/is-is-termin


    Configuration
    • [li]interface mtu ต้องเท่ากัน[/li]
      [li]clns mtu ต้องเท่ากัน[/li]

    key chain Area1 -> Key-Chain Name = Area1
    key 1 -> Key-ID "1"
      key-string cisco123 -> Password = cisco123
    !
    interface TenGigabitEthernet1/1
    ip router isis
    isis authentication mode md5 -> Authentication Mode = Message Digest
    isis authentication key-chain Area1 -> Authentication = Hello Packet Authentication
    !
    router isis
    net 49.0001.0000.0000.0011.00
    is-type level-2-only -> IS-Type = Level 2 Only
    metric-style wide -> Metric Style = Wide
    passive-interface Loopback0
    !

    Troubleshoot:

    • %CLNS-5-ADJCHANGE: ISIS: Adjacency to xxx (GigabitEthernet1/1/2) Down, neighbor forgot us: Configure "isis network point-to-point" แล้วสามารถแก้ปัญหาได้

    • %CLNS-4-AUTH_FAIL: ISIS: Serial IIH authentication failed: ตรวจสอบขาที่ isis neighbor ไม่ up ใส่ authentication ให้ถูกต้อง

      R1#deb isi adj
      061163: Oct  5 16:34:05.565 bkk: ISIS-Adj: Rec serial IIH from 4562.882a.4b5a (TenGigabitEthernet1/3), cir type L2, cir id 00, length 1496
      061164: Oct  5 16:34:05.565 bkk: ISIS-Adj: Authentication failed
      or
      061228: Oct  5 16:34:14.649 bkk: ISIS-Adj: Rec serial IIH from 4562.882a.4b5a (TenGigabitEthernet1/3), cir type L2, cir id 00, length 1496
      061229: Oct  5 16:34:14.649 bkk: %CLNS-4-AUTH_FAIL: ISIS: Serial IIH authentication failed

      R1#un all

      R1#sho isi nei | inc 1/3
      R1#

      Compare isis interface configuration both side. If the configuration is corrected, re-configure int te1/3.
      Cr: P'Teng@AIT

    • Init State:
      XR#debug isi adjacencies interface x
      RP/0/RSP0/CPU0:Oct 11 11:28:12.170 BKK: isis[1014]: SEND P2P IIH (L2) on Bundle-Ether9: Holdtime 30s, Length 9199
      RP/0/RSP0/CPU0:Oct 11 11:28:12.357 BKK: isis[1014]: RECV P2P IIH (L2) from Bundle-Ether9 SNPA 40ce.2418.9b52: System ID PN2, Holdtime 30, length 9198

    B-)