Tuning Bgp - Cisco Nexus 7000 Series Configuration Manual

Configuring Advanced BGP
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m .
This example shows how to enable advertising and receiving IPv4 and IPv6 routes for multicast RPF for
a neighbor.:
switch# config t
switch(config)# interface ethernet 2/1
switch(config-if)# ipv6 address 2001:0DB8::1
switch(config-if)# router bgp 65536
switch(config-router)# neighbor 192.168.1.2 remote-as 35537
switch(config-router-neighbor)# address-family ipv4 multicast
switch(config-router-neighbor-af)# exit
switch(config-router-neighbor)# address-family ipv6 multicast
switch(config-router-neighbor-af)# copy running-config startup-config

Tuning BGP

You can tune BGP characteristics through a series of optional parameters.
To tune BGB, use the following optional commands in router configuration mode:
Command
bestpath [always-compare-med |
compare-routerid | med {missing-as-worst |
non-deterministic}]
Example:
switch(config-router)# bestpath
always-compare-med
enforce-first-as
Example:
switch(config-router)# enforce-first-as
log-neighbor-changes
Example:
switch(config-router)#
log-neighbor-changes
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
11-36
Chapter 11
Purpose
Modifies the best-path algorithm. The optional
parameters are as follows:
always-compare-med—Compares MED on
•
paths from different autonomous systems.
compare-routerid—Compares the router IDs
•
for identical eBGP paths.
med missing-as-worst—Treats a missing
•
MED as the highest MED.
med non-deterministic—Does not always
•
pick the best MED path from among the paths
from the same autonomous system.
Enforces the neighbor autonomous system to be the
first AS number listed in the AS_path attribute for
eBGP.
Generates a system message when a neighbor
changes state.
Configuring Advanced BGP
OL-20002-02