Concept Guide

DellEMC(conf-router_bgpv6_af)# neighbor 50.0.0.2 activate
DellEMC(conf-router_bgp)# exit
Following is the output of show ip bgp vrf vrf1 summary command for the above conguration.
DellEMC#show ip bgp vrf vrf1 summary
BGP router identifier 1.1.1.1, local AS number 100
BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0
1 neighbor(s) using 16384 bytes of memory
Neighbor AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/Pfx
50.0.0.2 200 0 0 0 0 0 00:00:00 0
Following is the output of show running-config bgp command for the above conguration.
DellEMC#show running-config bgp
!
router bgp 10
bgp router-id 1.1.1.1
network 10.10.21.0/24
bgp four-octet-as-support
neighbor 20.20.20.1 remote-as 65550
neighbor 20.20.20.1 no shutdown
!
address-family ipv4 vrf vrf1
neighbor 50.0.0.2 maximum-prefix 10000 warning-only
neighbor 50.0.0.2 remote-as 200
neighbor 50.0.0.2 no shutdown
exit-address-family
!
address-family ipv4 multicast vrf vrf1
neighbor 50.0.0.2 activate
exit-address-family
!
address-family ipv6 unicast vrf vrf1
neighbor 50.0.0.2 activate
exit-address-family
DellEMC#
Route-refresh and Soft-reconguration
BGP soft-reconguration allows for faster and easier route changing.
Changing routing policies typically requires a reset of BGP sessions (the TCP connection) for the policies to take eect. Such resets cause
undue interruption to trac due to hard reset of the BGP cache and the time it takes to re-establish the session. BGP soft-reconguration
allows for policies to be applied to a session without clearing the BGP Session. Soft-reconguration can be done on a per-neighbor basis
and can either be inbound or outbound.
BGP soft-reconguration clears the policies without resetting the TCP connection.
To reset a BGP connection using BGP soft-reconguration, use the clear ip bgp command in EXEC Privilege mode at the system
prompt.
When you change the BGP inbound policy locally, you need to process the updates received from a peer. The route-refresh capability allows
the local peer to reset inbound information dynamically by exchanging route-refresh requests to supporting peers. When an inbound policy
conguration is changed, then the Dell EMC Networking OS sends a refresh request message asking the peer to re-advertise updates.
Upon receiving the refresh request, the peer advertises the required information after applying the outbound lters. Route-refresh is
negotiated during the BGP session establishment and will be used only if both the BGP peers support this capability.
To determine whether a BGP router supports this capability, use the show ip bgp neighbors command. If a router supports the
route-refresh capability, the following message displays:
Received route refresh capability from peer.
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Border Gateway Protocol (BGP)