OSPF vs RIP vs EIGRP
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BGP interview questions
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BGP protocol interview questions Q. What is a Local Preference? Q. What is the difference between EBGP and IBGP neighborship ?Q. What transport protocol does BGP use? Q. What is an AS_PATH and what is it used for? Q. How can you use BGP for load balancing traffic outbound? Q. […]
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ospf scenario
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ospf scenario Highest IP address ABR routes convert the type7 into type 5. Default route is not generated by default in area nssa unless “are nssa default originate ” configured. Totally stubby NSSA area generate the default route by default. DR/BDR does not support the preempt therefore if DR fails […]
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ospf scenario based questions
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ospf scenario based questions Scenario 1 – OSPF full neigborship is not coming up between routers — 1. Hello and Dead timer or Area ID, Authentication password/type/key or Area type are mismatch between router.2. Trying to build OSPF neigborship on secondary address.4. OSPF not enabled on correct interface or […]
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bgp troubleshooting scenarios
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BGP Troubleshooting Scenario 1- There are some reason router do not establish neighborship with peer- This is very important question for interview also 1) Peer ip address is not reachable. 2) port 179 is blocked by a firewall or access list. 3) BGP configuration is not correct like wrong […]
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ospf configuration troubleshooting
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There are some command to help troubleshoot of OSPF and configuration. 1- show ip protocols (this command confirm on router , how many protocol is running include OSPF) 2 – show ip route ( dynamic routes are learned by OSPF) 3- show ip ospf (display OSPF info for all OSPF processes) 4- show ip […]
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BGP Troubleshooting in advanced
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BGP Troubleshooting. Problem: BGP peer is not getting establish between routers. Cause : 1) Peer ip address is not reachable . 2) port 179 is blocked by firewall or access-list. 3) BGP configuration is not correct like wrong peer address local-as or remote-as, wrong AS number, wrong authentication/MD5 password or […]
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OSPF Troubleshooting like Exstart state exchange
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OSPF Troubleshooting– Problem :OSPF full neigborship is not coming up between routers Cause : 1. Hello and Dead timer or Area ID, Authentication password/type/key or Area type are mismatch between router. 2. Trying to build OSPF neigborship on secondary address. 4. OSPF not enabled on correct interface or network […]
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OSPF Troubleshooting (Stuck in 2 way state or Exchange state)
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OSPF Troubleshooting (Stuck in 2 way state or Exchange state) There is a difference between OSPF in 2-Way state and OSPF ‘stuck’ in 2-Way state. In a broadcast network, 2 routers who are neither DR or BDR, will form a 2-Way neighborship with each other and ‘FULL’ with the DR/BDRs […]