VPP/Segment Routing for MPLS
This example shows how to use the VPP platform to setup a L3VPN with SR MPLS. For further information regarding the SR MPLS implementation and CLI please visit the doxygen documentation. For further information on SRv6, tutorials and videos please visit www.segment-routing.net.
Contents
[hide]Introduction
Please see [https://wiki.fd.io/index.php?title=VPP/Segment_Routing_for_IPV6.
Topology Diagram
Our topology is simply going to be four VPP nodes with both, an IPv4 and IPv6 clients and servers attached to this core network. The 'core' network is running IPv4 only.
L3VPN for IPv6 traffic
In this example what we will do is on C1 create a SR Policy with only one SID list. This SID list will be <C2::, C4::6>. The SR policy will be using encapsulation. On C1 I will add an steering policy to steer all the L3 traffic destined to B::/112 via the BindingSID of the SR policy we just created before.
On C2 I will create one SR LocalSID with behavior End. (Endpoint)
On C4 I will create one SR LocalSID with behavior End.DX6 (Endpoint with Decapsulation and IPv6 cross-connect).
Note that this is a L3VPN for all traffic from A:: to B::. In this example the returning path is not shown. The user must create another SR policy at C4 with the appropriate SR LocalSIDs at the different nodes for the returning path.
Configuration on C1
vpp# set sr encaps source addr C1:: vpp# sr policy add bsid C1::999:1 next C2:: next C4::6 encap vpp# sr steer l3 B::/112 via sr policy bsid C1::999:1
This configuration can be verified with the CLI:
vpp# show sr pol SR policies: [0].- BSID: c1::999:1 Behavior: Encapsulation Type: Default FIB table: 0 Segment Lists: [0].- < c2::, c4::6 > weight: 1 ----------- vpp# show sr steering policies SR steering policies: Traffic SR policy BSID L3 b::/112 c1::999:1
Configuration on C2
vpp# sr localsid address C2:: behavior end
This configuration can be verified with the CLI:
vpp# show sr localsid SRv6 - My LocalSID Table: ========================= Address: c2:: Behavior: End Good traffic: [0 packets : 0 bytes] Bad traffic: [0 packets : 0 bytes] --------------------
Note that each SR LocalSID has counters for good and bad processed traffic. These counters can be cleared with
vpp# clear sr localsid counters
Configuration on C3
None
Configuration on C4
vpp# sr localsid address C4::6 behavior end.dx6 GigabitEthernet0/5/0 B:C5::B vpp# show sr localsid SRv6 - My LocalSID Table: ========================= Address: c4::6 Behavior: DX6 (Endpoint with decapsulation and IPv6 cross-connect) Iface: GigabitEthernet0/5/0 Next hop: b:c5::b Good traffic: [6686 packets : 678832 bytes] Bad traffic: [0 packets : 0 bytes] --------------------
L3VPN for IPv4 traffic
In this example what we will do is on C1 create a SR Policy with only one SID list. This SID list will be <C2::, C4::4>. The SR policy will be using encapsulation. On C1 I will add an steering policy to steer all the L3 traffic destined to 2.2.2.0/24 via the BindingSID of the SR policy we just created before.
On C2 I will create one SR LocalSID with behavior End. (Endpoint)
On C4 I will create one SR LocalSID with behavior End.DX4 (Endpoint with Decapsulation and IPv4 cross-connect).
Note that this is a L3VPN for all traffic from 1.1.1.0/24 to 2.2.2.0/24. In this example the returning path is not shown. The user must create another SR policy at C4 with the appropriate SR LocalSIDs at the different nodes for the returning path.
Configuration on C1
vpp# set sr encaps source addr C1:: vpp# sr policy add bsid C1::999:2 next C2:: next C4::4 encap vpp# sr steer l3 2.2.2.0/24 via sr policy bsid C1::999:2
Configuration on C2
vpp# sr localsid address C2:: behavior end
Note here that this is the same SR LocalSID as the one created for the L3VPN for IPv6 traffic. Hence, you don't need to type this again.
Configuration on C3
None
Configuration on C4
vpp# sr localsid address C4::4 behavior end.dx4 GigabitEthernet0/6/0 2.2.2.2 vpp# show sr localsid SRv6 - My LocalSID Table: ========================= Address: c4::4 Behavior: DX4 (Endpoint with decapsulation and IPv4 cross-connect) Iface: GigabitEthernet0/6/0 Next hop: 2.2.2.2 Good traffic: [0 packets : 0 bytes] Bad traffic: [0 packets : 0 bytes] --------------------
