3com DUA1750-2BAA01 Manual De Usuario

3Com Switch 8800 Configuration Guide 

Chapter 21  BGP Configuration

 

21-4 

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MP_REACH_NLRI: Multiprotocol Reachable NLRI, used to advertise reachable 

routes and the next hop information.  

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MP_UNREACH_NLRI: Multiprotocol Unreachable NLRI, used to delete 

unreachable routes.  

These two attributes are optional non-transitive. Therefore, the BGP speaker that does 

not provide multiple protocols ability will ignore the information of them nor transfer 

them to other peers. 

The network layer protocols are differentiated by address families in BGP. See 

RFC1700 (assigned numbers) for the possible values of these address families. The 

Switch 8800 provides various MBGP extended applications, including extension of 

multicast, VPN, and so on. Different extended applications should be configured in their 

own address family views. 

For more information about the commands executed in MBGP address family view, see 

“Multicast Protocol” and “MPLS Configuration” of this manual. 

A BGP speaker calls peers other BGP speakers which exchange information with it and 

multiple related peers compose a peer group. 

In the Switch 8800, a BGP peer must belong to a peer group. If you want to configure a 

BGP peer, you need first to create a peer group and then add a peer into the group.  

BGP peer group feature can simplify user configuration and improve route 

advertisement efficiency. When added into a peer group, a peer inherits all the 

configuration of the group.  

If the configuration of a peer group changes, the configuration of its member peers also 

alters. Some attributes can be configured to a particular member peer by specifying its 

IP address. The attributes configured in this way is with higher priority than those by 

configuring for peer group. It should be noted that all member peers must use the same 

update policy as its group, but may use different ingress policy. 

These categories are involved in BGP configuration:  

1) 

Basic BGP configuration 

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2) BGP 

peer 

configuration