Inter-AS VPWS in Alcatel-Lucent SR

Figure: Network diagram

In this post we will discuss on implementing L2 VPN service in Alcatel-Lucent. The two types of L2 VPN supported in ALU service router are VPWS or VLL and VPS. Different type of VPWS service exists based on network type: epipe, fpipe, apipe, ipipe. In our exercise we will configure epipe (e=ethernet) service.  

The configuration of epipe service is pretty simple in 7750SR. Refer here for service model.
To add a bit complexity, we will try it in an Inter-AS network environment.

The implementation approach in our example here is referred as Model-C. In this model BGP is used for signaling service label and LDP for transport label.

Router	Interface	IP Address
R1	system	50.50.50.1
	ToR2 (port 1/1/1)	192.168.12.1
R2	system	50.50.50.2
	ToR1 (port 1/1/1)	192.168.12.2
	ToR3 (port 1/1/4)	192.168.23.2
R3	system	50.50.50.3
	ToR2 (port 1/1/4)	192.168.23.3
	ToR4 (port 1/1/2)	192.168.34.3
R4	system	50.50.50.4
	ToR3 (port 1/1/2)	192.168.34.4
R5	E0/0	10.10.10.5
R6	E0/0	10.10.10.6

Table: Interface details

Step 1: IGP and LDP

IGP in the core is the base of LDP. We will implement ISIS in AS 65001 and OSPF in AS 65002.

ISIS Configuration in SR1 and SR2

SR1	SR2
configure router isis            level-capability level-2            area-id 49.0000            level 2                wide-metrics-only            exit            interface "system"            interface "ToR2"            exit            no shutdown	configure router isis            level-capability level-2            area-id 49.0000            level 2                wide-metrics-only            exit            interface "system"            interface "ToR1"            exit            no shutdown

ISIS verfication

A:SR2# show router isis adjacency =============================================================================== Router Base ISIS Instance 0 Adjacency =============================================================================== System ID                Usage State Hold Interface                     MT-ID ------------------------------------------------------------------------------- SR1                      L2    Up    19   ToR1                          0 ------------------------------------------------------------------------------- Adjacencies : 1 ===============================================================================

OSPF Configuration in SR3 and SR4

SR3	SR4
configure router ospf            area 0.0.0.0                interface "system"                interface "ToR4"	configure router ospf            area 0.0.0.0                interface "system"                interface "ToR3

OSPF verification

A:SR4# show router ospf neighbor =============================================================================== OSPFv2 (0) all neighbors =============================================================================== Interface-Name                   Rtr Id          State      Pri  RetxQ   TTL   Area-Id ------------------------------------------------------------------------------- ToR3                             50.50.50.3      Full       1    0       32   0.0.0.0 ------------------------------------------------------------------------------- No. of Neighbors: 1 ===============================================================================

Step 2: BGP IPv4 +Label

iBGP is configured between the PE and ASBR router in both the autonomous system. The advertise-label ipv4 statement must be configured so that MPLS labels are carried with IPv4 NLRIs. eBGP is configured between the two ASBRs, along with advertise-label statement. As usual, an export policy has to be configured in the ASBRs to advertise the system addresses to the remote AS.

BGP Configuration

SR1

SR2

configure router bgp         group "IBGP"               neighbor 50.50.50.2                    local-address 50.50.50.1                    peer-as 65001                    advertise-label ipv4                exit            exit            no shutdown

configure router bgp          group "IBGP"                next-hop-self                neighbor 50.50.50.1                    local-address 50.50.50.2                    peer-as 65001                    advertise-label ipv4                exit            exit            group "SP"                export "IGP-BGP"                split-horizon                neighbor 192.168.23.3                    peer-as 65002                    advertise-label ipv4                exit            exit            no shutdown

SR3

SR4

configure router bgp           group "IBGP"                next-hop-self                neighbor 50.50.50.4                    local-address 50.50.50.3                    peer-as 65002                    advertise-label ipv4                exit            exit            group "SP"                export "IGP-BGP"                split-horizon                neighbor 192.168.23.2                    peer-as 65001                    advertise-label ipv4                exit            exit            no shutdown

configure router bgp          group "IBGP"                neighbor 50.50.50.3                    local-address 50.50.50.4                    peer-as 65002                    advertise-label ipv4                exit            exit            no shutdown

SR2 and SR3 - Export Policy

configure router policy-options            begin                      prefix-list "RT50"                prefix 50.50.50.0/24 longer            exit            policy-statement "IGP-BGP"                entry 5                    from                        prefix-list "RT50"                    exit                    to                        protocol bgp                    exit                    action accept                exit            exit            commit

BGP verification

A:SR2# show router bgp summary …….output omitted…. =============================================================================== BGP Summary =============================================================================== Neighbor                   AS PktRcvd InQ  Up/Down   State|Rcv/Act/Sent (Addr Family)                      PktSent OutQ ------------------------------------------------------------------------------- 50.50.50.1                65001      40    0 00h20m39s 0/0/2 (IPv4)                           42    0 192.168.23.3                65002      44    0 00h20m41s 2/2/2 (IPv4)                           44    0 ------------------------------------------------------------------------------- A:SR3# show router bgp routes =============================================================================== BGP Router ID:50.50.50.3       AS:65002       Local AS:65002 =============================================================================== Legend - Status codes  : u - used, s - suppressed, h - history, d - decayed, * - valid Origin codes  : i - IGP, e - EGP, ? - incomplete, > - best, b - backup =============================================================================== BGP IPv4 Routes =============================================================================== Flag  Network                                            LocalPref   MED      Nexthop                                            Path-Id     Label      As-Path ------------------------------------------------------------------------------- u*>i  50.50.50.1/32                                      None        10      192.168.23.2                                       None        131066      65001 u*>i  50.50.50.2/32                                      None        None      192.168.23.2                                       None        131067      65001 ------------------------------------------------------------------------------- Routes : 2 ===============================================================================

Step 3: E-Pipe Service

Implementing an e-pipe service basically includes the following:

• Creation of Customer
• Creation of mpls SDP and configuring as bgp-tunnel
• Creation of E-Pipe service, and link with the SDP and SAP
  

E-Pipe service configuration

SR1	SR4
configure service customer 100 create configure service sdp 5 mpls create            far-end 50.50.50.4            bgp-tunnel            no shutdown configure service epipe 15 customer 100 create            sap 1/1/2 create            spoke-sdp 5:15 create            no shutdown	configure service customer 100 create configure service sdp 5 mpls create            far-end 50.50.50.1            bgp-tunnel            no shutdown configure service epipe 15 customer 100 create            sap 1/1/1 create            spoke-sdp 5:15 create            no shutdown

E-pipe verification

A:SR4# show router tunnel-table =============================================================================== Tunnel Table (Router: Base) =============================================================================== Destination           Owner Encap TunnelId  Pref     Nexthop        Metric ------------------------------------------------------------------------------- 50.50.50.1/32         sdp   MPLS  5         5        50.50.50.1     0 50.50.50.1/32         bgp   MPLS   -        10       50.50.50.3     1000 50.50.50.2/32         bgp   MPLS   -        10       50.50.50.3     1000 50.50.50.3/32         ldp   MPLS   -        9        192.168.34.3   100 ------------------------------------------------------------------------------- Flags: B = BGP backup route available       E = inactive best-external BGP route =============================================================================== A:SR4# show service sdp ============================================================================ Services: Service Destination Points ============================================================================ SdpId  AdmMTU  OprMTU  Far End          Adm  Opr         Del     LSP   Sig ---------------------------------------------------------------------------- 5      0       8910    50.50.50.1       Up   Up          MPLS    B     TLDP ---------------------------------------------------------------------------- Number of SDPs : 1 ---------------------------------------------------------------------------- Legend: R = RSVP, L = LDP, B = BGP, M = MPLS-TP, n/a = Not Applicable ============================================================================ A:SR4# show service id 15 base =============================================================================== Service Basic Information =============================================================================== Service Id        : 15                  Vpn Id            : 0 Service Type      : Epipe Name              : (Not Specified) Description       : (Not Specified) Customer Id       : 100                 Creation Origin   : manual Last Status Change: 11/26/2015 11:53:02 Last Mgmt Change  : 11/26/2015 11:50:32 Test Service      : No Admin State       : Up                  Oper State        : Up MTU               : 1514 Vc Switching      : False SAP Count         : 1                   SDP Bind Count    : 1 Per Svc Hashing   : Disabled Force QTag Fwd    : Disabled ------------------------------------------------------------------------------- Service Access & Destination Points ------------------------------------------------------------------------------- Identifier                               Type         AdmMTU  OprMTU  Adm  Opr ------------------------------------------------------------------------------- sap:1/1/1                                null         1514    1514    Up   Up sdp:5:15 S(50.50.50.1)                   Spok         0       8910    Up   Up

*The exercise is done in a virtual environment using Unetlab. Output may vary in real devices. Ask me if you need the lab files.