Concept Guide

Table 11. 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
Dell EMC Networking OS provides multiple ways to aggregate routes in the BGP routing table. At least one specic route of the aggregate
must be in the routing table for the congured 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 prex 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]
Example of Viewing Aggregated Routes
In the show ip bgp command, aggregates contain an ‘a’ in the rst column (shown in bold) and routes suppressed by the aggregate
contain an ‘s’ in the rst column.
DellEMC#show ip bgp
BGP table version is 0, local router ID is 10.101.15.13
Status codes: s suppressed, d damped, h history, * valid, > best
Path source: I - internal, a - aggregate, c - confed-external, r - redistributed, n - network
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 7.0.0.0/29 10.114.8.33 0 0 18508 ?
*> 7.0.0.0/30 10.114.8.33 0 0 18508 ?
*
>a 9.0.0.0/8 192.0.0.0 32768 18508 701 {7018 2686 3786} ?
*> 9.2.0.0/16 10.114.8.33 0 18508 701 i
*> 9.141.128.0/24 10.114.8.33 0 18508 701 7018 2686 ?
DellEMC#
Filtering BGP Routes
Filtering routes allows you to implement BGP policies.
You can use either IP prex lists, route maps, AS-PATH ACLs or IP community lists (using a route map) to control which routes the BGP
neighbor or peer group accepts and advertises. Prex lists lter routes based on route and prex length, while AS-Path ACLs lter routes
based on the ASN. Route maps can lter and set conditions, change attributes, and assign update policies.
NOTE
: Dell EMC Networking OS supports up to 255 characters in a set community statement inside a route map.
Border Gateway Protocol (BGP) 197