proxmox-mirrors/mirror_frr
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_frr synced 2025-08-13 17:40:04 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

doc: work around broken makeinfo on centos7

Browse Source 
Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
This commit is contained in:
Quentin Young 2018-03-22 12:01:13 -04:00
parent 4da7fda369
commit 0773854304
No known key found for this signature in database
GPG Key ID: DAF48E0F57E0834F
1 changed files with 25 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
doc/user/bgp.rst
View File

@ -100,72 +100,57 @@ BGP decision process
The decision process FRR BGP uses to select routes is as follows:
1. Weight check
1. *Weight check*
Prefer higher local weight routes to lower routes.
2. Local preference check
2. *Local preference check*
Prefer higher local preference routes to lower.
3. Local route check
3. *Local route check*
Prefer local routes (statics, aggregates, redistributed) to received routes.
4. AS path length check
4. *AS path length check*
Prefer shortest hop-count AS_PATHs.
5. Origin check
5. *Origin check*
Prefer the lowest origin type route. That is, prefer IGP origin routes to
EGP, to Incomplete routes.
6. MED check
6. *MED check*
Where routes with a MED were received from the same AS, prefer the route
with the lowest MED. :ref:`bgp-med`.
7. External check
7. *External check*
Prefer the route received from an external, eBGP peer over routes received
from other types of peers.
8. IGP cost check
8. *IGP cost check*
Prefer the route with the lower IGP cost.
9. Multi-path check
9. *Multi-path check*
If multi-pathing is enabled, then check whether the routes not yet
distinguished in preference may be considered equal. If
:clicmd:`bgp bestpath as-path multipath-relax` is set, all such routes are
considered equal, otherwise routes received via iBGP with identical AS_PATHs
or routes received from eBGP neighbours in the same AS are considered equal.
10. Already-selected external check
10. *Already-selected external check*
Where both routes were received from eBGP peers, then prefer the route
which is already selected. Note that this check is not applied if
:clicmd:`bgp bestpath compare-routerid` is configured. This check can
prevent some cases of oscillation.
11. Router-ID check
11. *Router-ID check*
Prefer the route with the lowest `router-ID`. If the route has an
`ORIGINATOR_ID` attribute, through iBGP reflection, then that router ID is
used, otherwise the `router-ID` of the peer the route was received from is
used.
12. Cluster-List length check
12. *Cluster-List length check*
The route with the shortest cluster-list length is used. The cluster-list
reflects the iBGP reflection path the route has taken.
13. Peer address
13. *Peer address*
Prefer the route received from the peer with the higher transport layer
address, as a last-resort tie-breaker.