X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fsrv6%2Fsr_steering.md;h=7e91892e0bc9f4c6b68f7b4d0b97ab2956439dd4;hb=8527f12b525181b47cc7c0c9e943a743b1a3b19e;hp=cf446f8171ec0fc02200cbf810bfad50d1f1fb27;hpb=f616d10d04d5c444e20e617841a54cfb2c58d07d;p=vpp.git

diff --git a/src/vnet/srv6/sr_steering.md b/src/vnet/srv6/sr_steering.md
index cf446f8171e..7e91892e0bc 100644
--- a/src/vnet/srv6/sr_steering.md
+++ b/src/vnet/srv6/sr_steering.md
@@ -1,5 +1,7 @@
 # Steering packets into a SR Policy     {#srv6_steering_doc}
 
+## steer packets uging the sr steering policy
+
 To steer packets in Transit into an SR policy (T.Insert, T.Encaps and T.Encaps.L2 behaviors), the user needs to create an 'sr steering policy'.
 
     sr steer l3 2001::/64 via sr policy index 1
@@ -9,3 +11,25 @@ To steer packets in Transit into an SR policy (T.Insert, T.Encaps and T.Encaps.L
     sr steer l2 TenGE0/1/0 via sr policy bsid cafe::1
 
 Disclaimer: The T.Encaps.L2 will steer L2 frames into an SR Policy. Notice that creating an SR steering policy for L2 frames will actually automatically *put the interface into promiscous mode*.
+
+## steer packets using the classifier
+
+Another way to steer packet is to use the classifier.
+
+First the user need to manually add the source routing node to the list of the
+ip6-inacl next nodes.
+Using the python api this can be donne with:
+
+    # jsonfiles = get list of json api files
+    vpp = VPP(jsonfiles)
+    vpp.add_node_next(node_name='ip6-inacl', next_name='sr-pl-rewrite-insert')
+
+Below is a classifier mask filtering all the packets from the interface
+TenGigabitEthernet5/0/0 on ip version and moving all ipv6 packets to the
+sr-pl-rewrite-insert node (dropping the others) and applying the source routing
+index 2.
+In essence, this means "apply this sr policy to all the packets from this interface)
+
+    vpp# classify table miss-next 0 current-data-flag 1  mask hex f000000000000000 skip 0
+    vpp# classify session acl-hit-next 1 table-index 0 match hex 6000000000000000 action set-sr-policy-index 2
+    vpp# set interface input acl intfc TenGigabitEthernet5/0/0 ip6-table 0