Cisco administrators and implementers come across queries related to BGP neighbor output. One such typical query is difference between “Implicit Withdraw” and “Explicit Withdraw” when one issues the command “show ip bgp neighbors” and output displays both the terms ie Explicit and Implicit. Below is one sample output –
R2#sh ip bgp neighb | include Withdraw
Implicit Withdraw: 0 10
Explicit Withdraw: 0 2
In simple terms, “Implicit Withdraw” counter increases when prefix has been withdrawn and re advertised. Most of times, prefix is updated with new attribute (Like metric change, AS path attribute change etc) and received by BGP speaking device.
“Explicit Withdraw” counter increases when prefix has been withdrawn because it is no longer feasible.
The above difference between both the terms can be illustrated in better way through below scenario –
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