Deployment Guide

768 | IPv6 Border Gateway Protocol (IPv6 BGP)
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Usage
Information
In non-deterministic mode, paths are compared in the order in which they arrive. This method can lead
to FTOS choosing different best paths from a set of paths, depending on the order in which they are
received from the neighbors since MED may or may not get compared between adjacent paths. In
deterministic mode (no bgp non-deterministic-med), FTOS compares MED between adjacent
paths within an AS group since all paths in the AS group are from the same AS.
When you change the path selection from deterministic to non-deterministic, the path selection for
existing paths remains deterministic until you enter capture bgp-pdu max-buffer-size command to clear
existing paths.
bgp recursive-bgp-next-hop
c e
Enable next-hop resolution through other routes learned by BGP.
Syntax
bgp recursive-bgp-next-hop
To disable next-hop resolution, use the no bgp recursive-bgp-next-hop command.
Defaults
Enabled
Command Modes
ROUTER BGP
Usage
Information
This command is a knob to disable BGP next-hop resolution via BGP learned routes. During the
next-hop resolution, only the first route that the next-hop resolves through is verified for the route’s
protocol source and is checked if the route is learned from BGP or not.
The clear ip bgp command is required for this command to take effect and to keep the BGP database
consistent. Execute the clear ip bgp command right after executing this command.
Related
Commands
Command
History
bgp regex-eval-optz-disable
c e
Disables the Regex Performance engine that optimizes complex regular expression with BGP.
Syntax
bgp regex-eval-optz-disable
To re-enable optimization engine, use the no bgp regex-eval-optz-disable command.
Defaults
Enabled by default
Command Modes
ROUTER BGP (conf-router_bgp)
capture bgp-pdu
max-buffer-size
Description.
Version 8.4.2.1 Introduced on C-Series and S4810.
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced on E-Series TeraScale