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Chika Nwokeoma, EzineArticles.com Basic Author
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How To Authenticate MD5 for BGP Peers

You can authenticate your BGP peer connection to help prevent interference  with your routing tables.
The BGP protocol includes an MD5-based authentication system for authenticating peers relationship. 
To enable MD5 authentication for BGP peers, use the command:
 neighbor {ip-address | peer-group-name} password string command under the BGP router configuration mode.
We use the network topology below as an example.
BGP Perrs Authentication
RHQ#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
RHQ(config)#router bgp 3500
RHQ(config-router)#neighbor remote-as 3501
RHQ(config-router)#neighbor password orbitA1F173D24
The same Authentication password must be configured on both routers:

RBRANCH#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
RBRANCH(config)#router bgp 3501
RBRANCH(config-router)#neighbor remote-as 3500
RBRANCH(config-router)#neighbor password orbitA1F173D24
Border Gateway Protocol (BGP) routing peers can be configured with Message Digest 5 (MD5) algorithm which is used to support routing authentication. The Message Digest 5 (MD5) authentication is a standard part of BGP Version 4 that was introduced in RFC 2385. When Message Digest 5 authentication is enabled on BGP peers, any routing segment via Transmission Control Protocol (TCP) exchanged between BGP peers is verified and established. BGP peers must be configured with the same password for BGP neighbor relationship or connection to be established. 
BGP authentication can be very useful because it makes it more difficult for an authorized or malicious user to disrupt your network routing tables. It will even be significantly difficult when your router have been enabled with the service password-encryption global configuration command which enables the router to store the command using the Cisco proprietary type 7 encryption:

router bgp 3500
neighbor remote-as 3501
neighbor password 7 15020A1F173D24362C7E64704053
With authentication of this type, network attack is considerably more difficult. This is because the attacker must not only get the TCP sequence numbers right, but he must also insert the correct encrypted authentication key.

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