Concept Guide

neighbor {ip-address | ipv6–address | peer-group-name} remote-as as-number
• Enable the neighbor.
CONFIG-ROUTERBGP mode
neighbor ip-address | ipv6-address | peer-group-name no shutdown
• Specify the IPv4 address family conguration.
CONFIG-ROUTER-BGP mode
address-family ipv4 [multicast | vrf vrf-name]
multicast — Species the IPv4 multicast address family.
vrf vrf-name — Species the name of VRF instance associated with the IPv4 address-family conguration.
• Enable the neighbor to exchange prexes for IPv4 unicast address family.
CONFIG-ROUTER-BGP-AF (Address Family) mode
neighbor {ip-address | ipv6–address | peer-group-name} activate
NOTE: Neighbors have to be activated using neighbor activate command in the respective address family. To exchange
other address prex types ( IPv4 or IPv6 multicast), the neighbors must be activated under the respective address family
conguration such as address-family ipv6 unicast(for IPv6) and address-family ipv4 multicast (for IPv4
multicast).
Example of conguring BGP Peers
DellEMC(conf)# router bgp 10
DellEMC(conf-router_bgp)# neighbor 20.20.20.1 remote-as 200
DellEMC(conf-router_bgp)# neighbor 20.20.20.1 no shutdown
DellEMC(conf-router_bgp)# address-family ipv4 multicast
DellEMC(conf-router_bgp_af)# neighbor 20.20.20.1 activate
DellEMC(conf-router_bgp_af)# exit
Following is the sample output of show ip bgp ipv4 multicast summary command.
DellEMC# show ip bgp ipv4 multicast summary
BGP router identifier 1.1.1.1, local AS number 10
BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0
1 neighbor(s) using 8192 bytes of memory
Neighbor AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/Pfx
20.20.20.1 200 0 0 0 0 0 00:00:00 0
DellEMC#
Conguring AS4 Number Representations
Enable one type of AS number representation: ASPLAIN, ASDOT+, or ASDOT.
Term
Description
ASPLAIN
Default method for AS number representation. With the ASPLAIN notation, a 32–bit binary AS number is
translated into a decimal value.
ASDOT+ A representation splits the full binary 4-byte AS number into two words of 16 bits separated by a decimal point (.):
<high-order 16 bit value>.<low-order 16 bit value>.
ASDOT A representation combines the ASPLAIN and ASDOT+ representations. AS numbers less than 65536 appear in
integer format (asplain); AS numbers equal to or greater than 65536 appear using the decimal method (asdot+).
For example, the AS number 65526 appears as 65526 and the AS number 65546 appears as 1.10.
Border Gateway Protocol (BGP) 203