Setup Guide

● Assign a weight to the neighbor connection.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6-address | peer-group-name} weight weight
○ weight: the range is from 0 to 65535.
The default is 0.
● Sets weight for the route.
CONFIG-ROUTE-MAP mode
set weight weight
○ weight: the range is from 0 to 65535.
To view BGP configuration, use the show config command in CONFIGURATION ROUTER BGP mode or the show
running-config bgp command in EXEC Privilege mode.
Enabling Multipath
By default, the software allows one path to a destination. You can enable multipath to allow up to 64 parallel paths to a
destination.
NOTE: Dell EMC Networking recommends not using multipath and add path simultaneously in a route reflector.
To allow more than one path, use the following command.
The show ip bgp network command includes multipath information for that network.
● Enable multiple parallel paths.
CONFIG-ROUTER-BGP mode
maximum-paths {ebgp | ibgp} number
Route Reflectors
Route reflectors reorganize the iBGP core into a hierarchy and allow some route advertisement rules.
NOTE:
Do not use route reflectors (RRs) in the forwarding path. In iBGP, hierarchal RRs maintaining forwarding plane RRs
could create routing loops.
Route reflection divides iBGP peers into two groups: client peers and nonclient peers. A route reflector and its client peers
form a route reflection cluster. Because BGP speakers announce only the best route for a given prefix, route reflector rules are
applied after the router makes its best path decision.
● If a route was received from a nonclient peer, reflect the route to all client peers.
● If the route was received from a client peer, reflect the route to all nonclient and all client peers.
To illustrate how these rules affect routing, refer to the following illustration and the following steps. Routers B, C, D, E, and G
are members of the same AS (AS100). These routers are also in the same Route Reflection Cluster, where Router D is the Route
Reflector. Router E and H are client peers of Router D; Routers B and C and nonclient peers of Router D.
Figure 25. BGP Router Rules
1. Router B receives an advertisement from Router A through eBGP. Because the route is learned through eBGP, Router B
advertises it to all its iBGP peers: Routers C and D.
Border Gateway Protocol (BGP)
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