Administrator Guide

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 update-source Loopback 0
neighbor 192.168.12.2 no shutdown
R2(conf-router_bgp)#
Allowing an AS Number to Appear in its Own AS Path
This command allows you to set the number of times a particular AS number can occur in the AS path.
The allow-as feature permits a BGP speaker to allow the ASN to be present for a specified number of times in the update
received from the peer, even if that ASN matches its own. The AS-PATH loop is detected if the local ASN is present more than
the specified number of times in the command.
● Allow this neighbor ID to use the AS path the specified number of times.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6-address | peer-group-name} allowas-in number
○ 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.
Border Gateway Protocol (BGP)
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