Cisco VoIP: Troubleshooting IP Phone Registration

1) Check DHCP configuration (option 150) 2) Check flash for firmware 3) Check tftp server command for files required 4) Commands: debug ephone register debug ip dhcp server events debug ip dhcp show ephone-dn summary … Continue reading Cisco VoIP: Troubleshooting IP Phone Registration →

Cisco R&S: Attributes used by BGP in route selection

Nexthop - Should be accessible, otherwise, drop. Largest Weight. Not part of the routing update. Largest Local Preference. Prefered path to a remote destination. Part of the routing update. Default is 100. Local to the AS. Originated by BGP running on this computer. Shortest AS-PATH. Lowest origin type. IGP < EGP < Incomplete Lowest MED … Continue reading Cisco R&S: Attributes used by BGP in route selection →

Cisco R&S: Verification Commands for BGP

#sh ip bgp - entries in BGP routing table #sh ip bgp neighbors - BGP and TCP connections to neighbors #sh ip bgp rib-failure - networks that are not installed in the RIB and reason why #sh ip bgp summary - status of all connections #show ip bgp neighbor address advertised #show ip bgp neighbor … Continue reading Cisco R&S: Verification Commands for BGP →

Cisco R&S: Frequent commands used when configuring BGP

#router bgp 100 - only one BGP process per router #network x.x.x.x mask x.x.x.x - using this command will not automatically form a neighbor relationship #neighbor x.x.x.x remote-as x.x.x.x - peer router #timers bgp x x - change the keepalive and holdtime timers respectively #neighbor x.x.x.x update-source Loopback 0 - Instruct the router to use … Continue reading Cisco R&S: Frequent commands used when configuring BGP →