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authorChristian Poessinger <christian@poessinger.com>2020-10-28 20:06:06 +0100
committerChristian Poessinger <christian@poessinger.com>2020-10-28 20:06:25 +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.