tailieunhanh - The Complete IS-IS Routing Protocol- P47

The Complete IS-IS Routing Protocol- P47: 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. | 462 15. Troubleshooting key 1 key-string 0 secret789 interface POS4 1 description to Frankfurt so-0 2 0 ip address ip router isis encapsulation ppp crc 16 clock source internal pos scramble-atm isis circuit-type level-1 router isis net authentication mode md5 authentication key-chain MY-ISIS-PASSWORD metric-style wide is-type level-1 passive-interface Loopback0 Let s see if the two configurations are working. Nope neither router sees the other. What could be wrong London sh clns neighbors System Id Interface SNPA State Holdtime Type Protocol hannes@Frankfurt show isis adjacency hannes@Frankfurt show isis interface IS-IS interface database Interface L CirID Level 1 DR Level 2 DR L1 L2 Metric 0 0x1 Disabled Passive 0 0 Missing PPP-OSICP Configuration In our phased troubleshooting approach first we ll check the underlying physical and logical interface IOS command output Only IPCP is up - The OSICP state is listening. London show interfaces pos4 1 POS4 1 is up line protocol is up Hardware is Packet over SONET Description to Frankfurt so-0 2 0 Internet address is 30 MTU 4470 bytes BW 155000Kbit DLY 100 usec rely 255 255 load 1 255 Case Studies 463 Encapsulation PPP crc 16 loopback not set Keepalive set 10sec Scramble enabled LCP Open Listen CDPCP OSICP Open IPCP . JUNOS command output On the JUNOS side we do not even attempt to open up the OSICP because the router is not configured to do so hannes@Frankfurt show interfaces so-0 2 0 Physical interface so-0 2 0 Enabled Physical link is Up Interface index 148 SNMP ifIndex 66 Description to London POS4 1 Link-level type PPP MTU 4474 Clocking Internal FCS 16 Payload scrambler Enabled Device flags Present Running Interface flags Point-To-Point SNMP-Traps Link flags Keepalives Keepalive settings Interval 10 seconds Up-count 1 Down-count 3 Keepalive Input 291 00 00 04 ago Output 296 00 00 03 ago LCP state Opened NCP state inet Opened inet6 .

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