tailieunhanh - The Complete IS-IS Routing Protocol- P22

The Complete IS-IS Routing Protocol- P22: IS-IS has always been my favourite Interior Gateway Protocol. Its elegant simplicity, its well-structured data formats, its flexibility and easy extensibility are all appealing – IS-IS epitomizes link-state routing. Whether for this reason or others, IS-IS is the IGP of choice in some of the world’s largest networks. | Pseudonodes 197 Point-to-point Adjacency State TLV 240 length 15 Adjacency State Up 0 Extended Local circuit-ID 0x00000041 Neighbor System-ID Neighbor Extended Local circuit-ID 0x0000005e Protocols supported TLV 129 length 2 NLPID s IPv4 0xcc IPv6 0x8e IPv4 Interface address es TLV 132 length 4 IPv4 interface address Area address es TLV 1 length 4 Area address length 3 Restart Signaling TLV 211 length 3 Flags none Remaining holding time 0s Both IOS and JUNOS support pseudonode suppression. In JUNOS you need to configure the point-to-point keyword inside the protocol isis interface stanza. JUNOS configuration In JUNOS pseudonode suppression is activated by adding the point-to-point keyword inside the protocols isis interface stanza. hannes@Stockholm show configuration . protocols isis . interface ge-2 2 point-to-point interface You can verify if the circuit was assigned to be a p2p media using the show isis interface command. JUNOS command output Once a broadcast circuit is configured for pseudonode suppression the Point to Point flag is listed instead of the DIS. hannes@Stockholm show isis interface IS-IS interface database Interface r I L CirlD Level 1 DR Level 2 DR L1 L2 Metric L . J ge-2 2 3 0x1 Point to Point 0 0x1 Passive Point to Point Passive 0 0 10000 10000 198 7. Pseudonodes and Designated Routers The IOS configuration is similar to JUNOS. Pseudonode suppression is once again an interface property and can be configured using the isis network point-to-point configuration statement. IOS configuration The IOS configuration requires the isis network point-to-point statement to suppress pseudonodes. Amsterdam show running-config . interface GigabitEthernet0 0 ip address ip router isis . isis network point-to-point Unfortunately there is no explicit hint in IOS to display if the interface is actually running in p2p mode. The only difference to a regular broadcast interface is that