Administrator Guide

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MP_UNREACH_NLRI, for feasible and withdrawn routes, respectively.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.
MBGP support for IPv6
MBGP suports IPv6 with same features and functionality as IPv4 BGP.
MBGP for IPv6 supports IPv6 address-family and Network Layer Reachability Information (NLRI) and next hop that uses IPv6
address.
Configuring IPv6 MBGP between peers
To configure IPv6 MBGP, use the following commands.
Following are the steps to configure IPv6 MBGP between two peers. The neighbors that are configured using neighbor
remote-as command exchange only the IPv4 unicast address prefixes. In order to exchange IPv6 address prefixes, you have
to activate the neighbors using neighbor activate command inside the address-family configuration.
NOTE:
When configuring a BGP peer under IPv6 address-family, both IPv4 and IPv6 prefixes are sent by default. If you do
not want a peer to exchange IPv4 prefixes, manually deactivate the peer with the no neighbor activate command
under the CONFIGURATION-ROUTER-BGP mode.
● Enter the router configuration mode and the AS number.
CONFIG mode
router bgp as-number
● Add the IP address of the neighbor for the specified autonomous system.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6–address | peer-group-name} remote-as as-number
● Specify the IPv6 address family configuration.
CONFIG-ROUTER-BGP mode
address-family ipv6 [unicast | vrf vrf-name]
unicast — Specifies the IPv6 unicast address family. The default address-family is IPv6 unicast.
vrf vrf-name — Specifies the name of VRF instance associated with the IPv6 address-family configuration.
● Enable the neighbor to exchange prefixes for IPv6 unicast address family.
CONFIG-ROUTER-BGP-AF (Address Family) mode
neighbor {ip-address | ipv6–address | peer-group-name} activate
DellEMC(conf)# router bgp 10
DellEMC(conf-router_bgp)# neighbor 2001::1 remote-as 200
DellEMC(conf-router_bgp)# neighbor 2001::1 no shutdown
DellEMC(conf-router_bgp)# address-family ipv6 unicast
DellEMC(conf-router_bgpv6_af)#neighbor 2001::1 activate
DellEMC(conf-router_bgpv6_af)#exit
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Border Gateway Protocol (BGP)