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authorrebortg <github@ghlr.de>2020-11-29 21:32:45 +0100
committerrebortg <github@ghlr.de>2020-11-29 21:32:45 +0100
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-.. include:: ../_include/need_improvement.txt
-
-######
-Policy
-######
-
-Routing Policies could be used to tell the router (self or neighbors) what
-routes and their attributes needs to be put into the routing table.
-
-There could be a wide range of routing policies. Some examples are below:
-
-* Set some metric to routes learned from a particular neighbor
-* Set some attributes (like AS PATH or Community value) to advertised routes to neighbors
-* Prefer a specific routing protocol routes over another routing protocol running on the same router
-
-Example
-=======
-
-**Policy definition:**
-
-.. code-block:: none
-
- # Create policy
- set policy route-map setmet rule 2 action 'permit'
- set policy route-map setmet rule 2 set as-path-prepend '2 2 2'
-
- # Apply policy to BGP
- set protocols bgp 1 neighbor 203.0.113.2 address-family ipv4-unicast route-map import 'setmet'
- set protocols bgp 1 neighbor 203.0.113.2 address-family ipv4-unicast soft-reconfiguration 'inbound'
-
-Using 'soft-reconfiguration' we get the policy update without bouncing the
-neighbor.
-
-**Routes learned before routing policy applied:**
-
-.. code-block:: none
-
- vyos@vos1:~$ show ip bgp
- BGP table version is 0, local router ID is 192.168.56.101
- Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
- r RIB-failure, S Stale, R Removed
- Origin codes: i - IGP, e - EGP, ? - incomplete
-
- Network Next Hop Metric LocPrf Weight Path
- *> 198.51.100.3/32 203.0.113.2 1 0 2 i < Path
-
- Total number of prefixes 1
-
-**Routes learned after routing policy applied:**
-
-.. code-block:: none
-
- vyos@vos1:~$ sho ip b
- BGP table version is 0, local router ID is 192.168.56.101
- Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
- r RIB-failure, S Stale, R Removed
- Origin codes: i - IGP, e - EGP, ? - incomplete
-
- Network Next Hop Metric LocPrf Weight Path
- *> 198.51.100.3/32 203.0.113.2 1 0 2 2 2 2 i
-
- Total number of prefixes 1
- vyos@vos1:~$
-
-You now see the longer AS path.