Concept Guide

○ peer-group-name: 16 characters.
○ Number: 1 through 10.
Format: IP Address: A.B.C.D and IPv6 adress: X:X:X:X::X.
You must Configure Peer Groups before assigning it to an AS.
The lines shown in bold are the number of times ASN 65123 can appear in the AS path (allows–in 9).
To disable this feature, use the no neighbor allow-as in number command in CONFIGURATION ROUTER BGP mode.
R2(conf-router_bgp)#show conf
!
router bgp 65123
bgp router-id 192.168.10.2
network 10.10.21.0/24
network 10.10.32.0/24
network 100.10.92.0/24
network 192.168.10.0/24
bgp four-octet-as-support
neighbor 10.10.21.1 remote-as 65123
neighbor 10.10.21.1 filter-list Laura in
neighbor 10.10.21.1 no shutdown
neighbor 10.10.32.3 remote-as 65123
neighbor 10.10.32.3 no shutdown
neighbor 100.10.92.9 remote-as 65192
neighbor 100.10.92.9 local-as 6500
neighbor 100.10.92.9 no shutdown
neighbor 192.168.10.1 remote-as 65123
neighbor 192.168.10.1 update-source Loopback 0
neighbor 192.168.10.1 no shutdown
neighbor 192.168.12.2 remote-as 65123
neighbor 192.168.12.2 allowas-in 9
neighbor 192.168.12.2 update-source Loopback 0
neighbor 192.168.12.2 no shutdown
R2(conf-router_bgp)#R2(conf-router_bgp)#
Enabling MBGP Configurations
Multiprotocol BGP (MBGP) is an enhanced BGP that carries IP multicast routes. BGP carries two sets of routes: one set
for unicast routing and one set for multicast routing. The routes associated with multicast routing are used by the protocol
independent multicast (PIM) to build data distribution trees.
Dell EMC Networking OS MBGP is implemented per RFC 1858. You can enable the MBGP feature per router and/or per peer/
peer-group.
The default is IPv4 Unicast routes.
When you configure a peer to support IPv4 multicast, Dell EMC Networking OS takes the following actions:
● Send a capability advertisement to the peer in the BGP Open message specifying IPv4 multicast as a supported AFI/SAFI
(Subsequent Address Family Identifier).
● If the corresponding capability is received in the peer’s Open message, BGP marks the peer as supporting the AFI/SAFI.
● When exchanging updates with the peer, BGP sends and receives IPv4 multicast routes if the peer is marked as supporting
that AFI/SAFI.
● Exchange of IPv4 multicast route information occurs through the use of two new attributes called MP_REACH_NLRI and
MP_UNREACH_NLRI, for feasible and withdrawn routes, respectively.
● If the peer has not been activated in any AFI/SAFI, the peer remains in Idle state.
Most Dell EMC Networking OS BGP IPv4 unicast commands are extended to support the IPv4 multicast RIB using extra options
to the command. For a detailed description of the MBGP commands, refer to the Dell EMC Networking OS Command Line
Interface Reference Guide.
Border Gateway Protocol (BGP)
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