Administrator Guide

DellEMC(conf-router_bgp)#do clear ip bgp 20::2 soft in
May 8 15:40:08 : BGP: 20::2 sending ROUTE_REFRESH AFI/SAFI (1/1)
May 8 15:40:08 : BGP: 20::2 sending ROUTE_REFRESH AFI/SAFI (2/1)
May 8 15:40:08 : BGP: 20::2 UPDATE rcvd packet len 56
May 8 15:40:08 : BGP: 20::2 rcvd UPDATE w/ attr: origin ?, path 200, nexthop 20.1.1.2,
metric 0,
Controlling route-refresh updates
You can control route-refresh updates for IPv4 and IPv6 prefixes.
Following is the list of commands to control the route-refresh updates for IPv4 and IPv6 prefixes:
Table 10. Command for respective route-refresh updates
Command Route-refresh Updates
clear ip bgp neighbor-ipv4-address ipv4 unicast soft in
Only IPv4 route-refresh updates using
IPv4 neighbor
clear ip bgp neighbor-ipv6-address ipv6 unicast soft in
Only IPv6 route-refresh updates using
IPv6 neighbor
clear ip bgp neighbor-ipv4-address ipv6 unicast soft in
Only IPv6 route-refresh updates using
IPv4 neighbor
clear ip bgp neighbor-ipv6-address ipv4 unicast soft in
Only IPv4 route-refresh updates using
IPv6 neighbor
Aggregating Routes
When BGP peers exchange information about the networks, a large BGP routing tables is created. Dell EMC Networking OS
provides multiple ways to aggregate routes to reduced the size of the BGP routing table which helps to improve the network
performance by reducing the convergence time. You can configure BGP to configure and advertise aggregated routes. At least
one specific route of the aggregate must be in the routing table for the configured aggregate to become active.
To aggregate routes, use the following command.
AS_SET includes AS_PATH and community information from the routes included in the aggregated route.
● Assign the IP address and mask of the prefix to be aggregated.
CONFIG-ROUTER-BGP mode
aggregate-address ip-address mask [advertise-map map-name] [as-set] [attribute-map map-
name] [summary-only] [suppress-map map-name]
○ as-set- Specify that the advertised path of this route is an AS_SET.
○ summary-only-Create aggregate route and suppress advertisements of specific routes to all neighbors.
○
suppress-map map-name-Create aggregate route by suppressing the advertisements of specific routes.
○ advertise-map map-name-Create aggregate route by advertising specific routes.
Configuring BGP aggregate routes
To create an aggregate route entry in the BGP routing table, use the following commands.
The aggregate route is advertised from the autonomous system.
● Enter the router configuration mode and the AS number for the specific BGP routing process.
CONFIG mode
router bgp as-number
● Create an aggregate entry in the BGP routing table.
CONFIG-ROUTER-BGP mode
Border Gateway Protocol (BGP)
193