Reference Guide

Additional paths
The add-path command is disabled by default.
1. Assign an AS number in CONFIGURATION mode.
router bgp as-number
2. Enter a neighbor and IP address (A.B.C.D) in ROUTER-BGP mode.
neighbor ip-address
3. Enter Address Family mode in ROUTER-NEIGHBOR mode.
address-family {[ipv4 | ipv6] [unicast])
4. Allow the specified neighbor to send or receive multiple path advertisements in ROUTER-BGP mode. The count parameter
controls the number of paths that are advertised — not the number of paths received.
add-path [both | received | send] count
Enable additional paths
OS10(config)# router bgp 102
OS10(conf-router-bgp-102)# neighbor 32.1.1.2
OS10(conf-router-neighbor)# address-family ipv4 unicast
OS10(conf-router-bgp-neighbor-af)# add-path both 3
MED attributes
OS10 uses the MULTI_EXIT_DISC or MED attribute when comparing EBGP paths from the same AS. MED comparison is not
performed in paths from neighbors with different AS numbers.
1. Enable MED comparison in the paths from neighbors with different AS in ROUTER-BGP mode.
always-compare-med
2. Change the best path MED selection in ROUTER-BGP mode.
bestpath med {confed | missing-as-best}
● confed—Selects the best path MED comparison of paths learned from BGP confederations.
● missing-as-best—Treats a path missing an MED as the most preferred one.
● missing-as-worst—Treats a path missing an MED as the least preferred one.
Modify MED attributes
OS10(config)# router bgp 100
OS10(conf-router-bgp-100)# always-compare-med
OS10(conf-router-bgp-100)# bestpath med confed
Local preference attribute
You can change the value of the LOCAL_PREFERENCE attributes for all routes the router receives. To change the
LOCAL_PREF value in ROUTER-BGP mode from 0 to 4294967295 with default 100, use the default local preference
value command.
To view the BGP configuration, use the show running-configuration command. A more flexible method for manipulating
the LOCAL_PREF attribute value is to use a route-map.
1. Assign a name to a route map in CONFIGURATION mode.
route-map map-name {permit | deny | sequence-number}
Layer 3
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