Decomposition border gateway protocol (BGP)

A decomposed border gateway protocol (BGP) can still continue an eBGP session between an internal node and an external node when a failover occurs at a border at which the eBGP session is established. The eBGP control traffic is captured by the peripheral router and forwarded to the BGP speaker on the internal node through the IP channel. A failover is detected in response to a change in a source address of the IP channel that receives the eBGP control traffic. The BGP speaker advertises a route to the external node that includes a reference to the internal address of the running peripheral router. In response to failover, the BGP speaker announces the updated route to refer to a backup router of the peripheral router.