Categories R&S

BGP – implement and troubleshoot Peerings – Authentication

One quick post about BGP authentication.   Requirements: Use BGP authentication to secure the BGP session between R6 and R10.   Diagram:   Configuration and verification: That’s an easy configuration. Only one command under the BGP process. R6(config)#router bgp 100 R6(config-router)#neighbor 10.10.1.10 password CISCO R10(config-router)#neighbor 10.100.1.6 password CISCO R10# clear ip bgp *   We […]

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Categories R&S

BGP – implement and troubleshoot Peerings – Neighbor Disable-Connected-Check

Following my previous post with ebgp multihop, we have another way to establish eBGP peering when neighbor are peering using their loopbacks.   Requirements : Establish the eBGP session between R10 and R6 using their loopbacks.   Diagram:   Configuration and verification: I configure the peering between R10 and R6 using their loopback. R10(config-router)#neighbor 10.100.1.6 […]

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Categories R&S

BGP – implement and troubleshoot Peerings – Update Source Modification

To improve a BGP network redundancy, we might want to establish a peering over two different links. Update Source Modification can be used in this case.   Theory: BGP peering doesn’t require a direct connection between two neighbors. But the IP source used to establish the peering is the IP address of the outgoing interface. […]

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