Example for Configuring Carrier's Carrier Solution 2 (LDP Label Distribution for BGP)
If a Level 1 carrier and Level 2 carriers belong to different ASs and no MP-IBGP peer relationships are established between the Level 1 carrier CEs and Level 2 carrier PEs, you can configure LDP to distribute labels to BGP routes so that the Level 2 carriers can provide BGP/MPLS IP VPN services.
Networking Requirements
As shown in Figure 1, the Level 1 carrier and Level 2 carrier are in the different ASs, and the Level 2 carrier provides BGP/MPLS IP VPN services for its clients.
After learning the labeled BGP routes of the public network from the Level 1 carrier's devices, the Level 2 carrier imports these routes to the IGP routing table. In this manner, LDP can distribute labels for these routes, and establish a complete LDP LSP between the Level 2 carrier PEs. The solution of inter-AS carrier's carrier can then be realized.
Deployment Roadmap
The configuration roadmap is as follows:
The two types of routes are exchanged as follows:
Exchange of the internal routes of the Level 2 carrier on the backbone network of Level 1 carrier: Configure the Level 2 carrier to access the Level 1 carrier as the Level 1 carrier CE.
Exchange of the external routes of the Level 2 carrier between Level 2 carrier PEs: Set up an MP-EBGP peer relationship between Level 2 carrier PEs (PE3 and PE4).
Carrier's carrier is configured across different ASs. In this case, the Level 1 carrier PEs and CEs are in different ASs. To distribute labels for the routes exchanged between PEs and CEs, the labeled MP-EBGP peer relationship needs to be established between CEs and PEs.
On the Level 1 carrier CE, import BGP routes to the IGP routing table.
On the Level 1 carrier CE, configure LDP to distribute labels to the labeled BGP routes of the public network.
Data Preparation
To complete the configuration, you need the following data:
- MPLS LSR IDs of the Level 1 carrier PEs and CEs and Level 2 carrier PEs
- Data required for configuring an IGP
- Name, RD, and VPN target of the VPN instance created on the PEs
- Two route-policies on the Level 1 carrier CEs
Procedure
- Configure BGP/MPLS IP VPN on the Level 1 carrier backbone network and configure IS-IS as an IGP of the backbone network. Enable LDP between PE1 and PE2, and establish an MP-IBGP peer relationship.
# Configure PE1.
<~HUAWEI> system-view [~HUAWEI] sysname PE1 [*HUAWEI] commit [~PE1] interface loopback 1 [*PE1-LoopBack1] ip address 3.3.3.9 32 [*PE1-LoopBack1] quit [*PE1] mpls lsr-id 3.3.3.9 [*PE1] mpls [*PE1-mpls] quit [*PE1] mpls ldp [*PE1-mpls-ldp] quit [*PE1] isis 1 [*PE1-isis-1] network-entity 10.0000.0000.0004.00 [*PE1-isis-1] quit [*PE1] interface loopback 1 [*PE1-LoopBack1] isis enable 1 [*PE1-LoopBack1] quit [*PE1] interface gigabitethernet 0/1/8 [*PE1-Gigabitethernet0/1/8] ip address 30.1.1.1 24 [*PE1-Gigabitethernet0/1/8] isis enable 1 [*PE1-Gigabitethernet0/1/8] mpls [*PE1-Gigabitethernet0/1/8] mpls ldp [*PE1-Gigabitethernet0/1/8] quit [*PE1] bgp 100 [*PE1-bgp] peer 4.4.4.9 as-number 100 [*PE1-bgp] peer 4.4.4.9 connect-interface loopback 1 [*PE1-bgp] ipv4-family vpnv4 [*PE1-bgp-af-vpnv4] peer 4.4.4.9 enable [*PE1-bgp-af-vpnv4] commit [~PE1-bgp-af-vpnv4] quit [~PE1-bgp] quit
The configuration of PE2 is similar to that of PE1. For configuration details, see Configuration Files in this section.
After PE1 and PE2 are configured, run the display mpls ldp session command on either of them. The command output shows that the LDP session has been set up successfully. Run the display bgp peer command on either of them. The command output shows that the BGP peer relationship has been established. Run the display isis peer command on either of them. The command output shows that the IS-IS neighbor relationship is Up.
The following example uses the command output on PE1.
[~PE1] display mpls ldp session LDP Session(s) in Public Network Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDDD:HH:MM) A '*' before a session means the session is being deleted. ---------------------------------------------------------------- PeerID Status LAM SsnRole SsnAge KASent/Rcv ---------------------------------------------------------------- 4.4.4.9:0 Operational DU Active 0000:00:01 8/8 ---------------------------------------------------------------- TOTAL: 1 session(s) Found [~PE1] display bgp peer BGP local router ID : 3.3.3.9 Local AS number : 100 Total number of peers : 1 Peers in established state : 1 Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv 4.4.4.9 4 100 7 8 0 00:02:47 Established 0 [~PE1] display isis peer Peer information for ISIS (1) System Id Interface Circuit Id State HoldTime Type PRI ------------------------------------------------------------------------------- 0000.0000.0005 Gigabitethernet 0000.0000.0005.01 Up 7s L1 (L1L2) 64 0000.0000.0005 Gigabitethernet 0000.0000.0005.01 Up 7s L2 (L1L2) 64 Total Peer(s): 2
- Configure the Level 2 carrier network and IS-IS as an IGP. Enable LDP between PE3 and CE1, and between PE4 and CE2.
# Configure PE3.
<~HUAWEI> system-view [~HUAWEI] sysname PE3 [*HUAWEI] commit [~PE3] interface loopback 1 [*PE3-LoopBack1] ip address 1.1.1.9 32 [*PE3-LoopBack1] quit [*PE3] mpls lsr-id 1.1.1.9 [*PE3] mpls [*PE3-mpls] quit [*PE3] mpls ldp [*PE3-mpls-ldp] quit [*PE3] interface gigabitethernet 0/1/8 [*PE3-GigabitEthernet0/1/8] ip address 40.1.1.1 24 [*PE3-GigabitEthernet0/1/8] mpls [*PE3-GigabitEthernet0/1/8] mpls ldp [*PE3-GigabitEthernet0/1/8] commit [~PE3-GigabitEthernet0/1/8] quit [~PE3] ospf 1 [*PE3-ospf-1] area 0 [*PE3-ospf-1-area-0.0.0.0] network 40.1.1.0 0.0.0.255 [*PE3-ospf-1-area-0.0.0.0] network 1.1.1.9 0.0.0.0 [*PE3-ospf-1-area-0.0.0.0] commit [~PE3-ospf-1-area-0.0.0.0] quit [~PE3-ospf-1] quit
# Configure CE1.
<~HUAWEI> system-view [~HUAWEI] sysname CE1 [*HUAWEI] commit [~CE1] interface loopback 1 [*CE1-LoopBack1] ip address 2.2.2.9 32 [*CE1-LoopBack1] quit [*CE1] mpls lsr-id 2.2.2.9 [*CE1] mpls [*CE1-mpls] quit [*CE1] mpls ldp [*CE1-mpls-ldp] quit [*CE1] interface gigabitethernet 0/1/0 [*CE1-Gigabitethernet0/1/0] ip address 40.1.1.2 24 [*CE1-Gigabitethernet0/1/0] mpls [*CE1-Gigabitethernet0/1/0] mpls ldp [*CE1-Gigabitethernet0/1/0] commit [~CE1-Gigabitethernet0/1/0] quit [~CE1] ospf 1 [*CE1-ospf-1] area 0 [*CE1-ospf-1-area-0.0.0.0] network 40.1.1.0 0.0.0.255 [*CE1-ospf-1-area-0.0.0.0] network 2.2.2.9 0.0.0.0 [*CE1-ospf-1-area-0.0.0.0] commit [~CE1-ospf-1-area-0.0.0.0] quit [~CE1-ospf-1] quit
After the configuration is complete, PE3 and CE1 can establish an LDP peer relationship and an OSPF neighbor relationship.
The configurations of PE4 and CE2 are similar to those of PE3 and CE1. For configuration details, see Configuration Files in this section.
- Configure the Level 1 carrier CE to access the Level 1 carrier PE. Configure the exchange of labeled IPv4 routes between them.
# Configure CE1 to exchange labeled IPv4 routes with PE1.
<~CE1> system-view [~CE1] interface gigabitethernet 0/1/8 [*CE1-Gigabitethernet0/1/8] ip address 11.1.1.1 24 [*CE1-Gigabitethernet0/1/8] mpls [*CE1-Gigabitethernet0/1/8] quit [*CE1] route-policy policy1 permit node 1 [*CE1-route-policy] apply mpls-label [*CE1-route-policy] quit [*CE1] bgp 200 [*CE1-bgp] peer 11.1.1.2 as-number 100 [*CE1-bgp] peer 11.1.1.2 route-policy policy1 export [*CE1-bgp] peer 11.1.1.2 label-route-capability [*CE1-bgp] import-route ospf 1 [*CE1-bgp] commit [~CE1-bgp] quit [~CE1] ospf 1 [*CE1-ospf-1] area 0 [*CE1-ospf-1-area-0.0.0.0] network 11.1.1.0 0.0.0.255 [*CE1-ospf-1-area-0.0.0.0] commit [~CE1-ospf-1-area-0.0.0.0] quit [~CE1-ospf-1] quit
# Configure PE1 to exchange labeled IPv4 routes with CE1.
To ensure normal forwarding, configure only the per-route per-label mode in a VPN instance.
<~PE1> system-view [~PE1] ip vpn-instance vpn1 [*PE1-vpn-instance-vpn1] ipv4-family [*PE1-vpn-instance-vpn1-af-ipv4] route-distinguisher 200:1 [*PE1-vpn-instance-vpn1-af-ipv4] apply-label per-route [*PE1-vpn-instance-vpn1-af-ipv4] vpn-target 1:1 both [*PE1-vpn-instance-vpn1-af-ipv4] quit [*PE1-vpn-instance-vpn1] quit [*PE1] interface gigabitethernet 0/1/0 [*PE1-Gigabitethernet0/1/0] ip binding vpn-instance vpn1 [*PE1-Gigabitethernet0/1/0] ip address 11.1.1.2 24 [*PE1-Gigabitethernet0/1/0] mpls [*PE1-Gigabitethernet0/1/0] quit [*PE1] route-policy policy1 permit node 1 [*PE1-route-policy] apply mpls-label [*PE1-route-policy] quit [*PE1] bgp 100 [*PE1-bgp] ipv4-family vpn-instance vpn1 [*PE1-bgp-vpn1] peer 11.1.1.1 as-number 200 [*PE1-bgp-vpn1] peer 11.1.1.1 route-policy policy1 export [*PE1-bgp-vpn1] peer 11.1.1.1 label-route-capability [*PE1-bgp-vpn1] import-route direct [*PE1-bgp-vpn1] commit [~PE1-bgp-vpn1] quit [~PE1-bgp] quit [~PE1] ospf 1 [*PE1-ospf-1] area 0 [*PE1-ospf-1-area-0.0.0.0] network 11.1.1.0 0.0.0.255 [*PE1-ospf-1-area-0.0.0.0] network 3.3.3.9 0.0.0.0 [*PE1-ospf-1-area-0.0.0.0] commit [~PE1-ospf-1-area-0.0.0.0] quit [~PE1-ospf-1] quit
After the configuration, the BGP peer relationship is set up between CE1 and PE1, and between CE2 and PE2.
[~CE1] display bgp peer BGP local router ID : 2.2.2.9 Local AS number : 200 Total number of peers : 1 Peers in established state : 1 Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv 11.1.1.2 4 100 210 225 0 03:31:49 Established 7 The configuration between CE2 and PE2 is similar to that between CE1 and PE1. For configuration details, see Configuration Files in this section.
- On the Level 1 carrier CE, import BGP routes to the IGP routing table.
# Configure CE1.
[~CE1] ospf 1 [*CE1-ospf-1] import-route bgp [*CE1-ospf-1] commit [~CE1-ospf-1] quit
# Configure CE2.
[~CE2] ospf 1 [*CE2-ospf-1] import-route bgp [*CE2-ospf-1] commit [~CE2-ospf-1] quit
After completing the configuration, run the display ip routing-table command on PE3 and PE4. The command output shows that the PEs can learn routes destined for each other.
The following example uses the command output on PE3.
[~PE3] display ip routing-table Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route ------------------------------------------------------------------------------ Routing Table: Public Destinations : 12 Routes : 12 Destination/Mask Proto Pre Cost Flags NextHop Interface 1.1.1.9/32 Direct 0 0 D 127.0.0.1 LoopBack1 2.2.2.9/32 OSPF 10 1 D 40.1.1.2 Gigabitethernet0/1/8 5.5.5.9/32 O_ASE 150 1 D 40.1.1.2 Gigabitethernet0/1/8 6.6.6.9/32 O_ASE 150 1 D 40.1.1.2 Gigabitethernet0/1/8 11.1.1.0/32 OSPF 10 2 D 40.1.1.2 Gigabitethernet0/1/8 40.1.1.0/24 Direct 0 0 D 40.1.1.1 Gigabitethernet0/1/8 40.1.1.1/32 Direct 0 0 D 127.0.0.1 Gigabitethernet0/1/8 40.1.1.2/32 Direct 0 0 D 40.1.1.2 Gigabitethernet0/1/8 20.1.1.0/24 O_ASE 150 1 D 40.1.1.2 Gigabitethernet0/1/8 21.1.1.0/24 O_ASE 150 1 D 40.1.1.2 Gigabitethernet0/1/8 21.1.1.2/32 OSPF 10 5 D 40.1.1.2 Gigabitethernet0/1/8 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
- On the Level 1 carrier CE, configure LDP to distribute labels to the labeled BGP routes of the public network.
# Configure CE1.
[~CE1] mpls [*CE1-mpls] lsp-trigger bgp-label-route [*CE1-mpls] commit [~CE1-mpls] quit
# Configure CE2.
[~CE2] mpls [*CE2-mpls] lsp-trigger bgp-label-route [*CE2-mpls] commit [~CE2-mpls] quit
After the configuration, run the display ip routing-table dest-ip-address verbose command on PE1. The command output shows that the routes from CE1 to PE4 are labeled BGP routes of the public network: The routing table is Public, the protocol type is BGP, and the label has a non-zero value.
The following example uses the command output on CE1.
[~CE1] display ip routing-table 6.6.6.9 verbose Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route ------------------------------------------------------------------------------ Routing Table : Public Summary Count : 1 Destination: 6.6.6.9/32 Protocol: EBGP Process ID: 0 Preference: 255 Cost: 0 NextHop: 11.1.1.2 Neighbour: 11.1.1.2 State: Active Adv Age: 00h38m36s Tag: 0 Priority: low Label: 3079 QoSInfo: 0x0 IndirectID: 0x0 RelayNextHop: 0.0.0.0 Interface: Gigabitethernet0/1/8 TunnelID: 0x1408007 Flags: D IndirectID: 0x0 RelayNextHop: 0.0.0.0 Interface: Gigabitethernet0/1/8 TunnelID: 0x6002006 Flags: D
Run the display mpls lsp protocol ldp include dest-ip-address mask-length verbose command on CE1 and PE4. The command output shows that an LDP egress LSP and an LDP ingress LSP are established on CE1 and PE4, respectively.
[~CE1] display mpls lsp protocol ldp include 6.6.6.9 32 verbose ---------------------------------------------------------------------- LSP Information: LDP LSP ---------------------------------------------------------------------- No : 1 VrfIndex : Fec : 6.6.6.9/32 Nexthop : 11.1.1.2 In-Label : 1027 Out-Label : NULL In-Interface : ---------- Out-Interface : ---------- LspIndex : 10247 Token : 0x0 FrrToken : 0x0 LsrType : Egress Outgoing token : 0x6002006 Label Operation : POPGO Mpls-Mtu : ------ TimeStamp : 6130sec Bfd-State : --- BGPKey : --- [PE4] display mpls lsp protocol ldp include 2.2.2.9 32 verbose ------------------------------------------------------------------------------- LSP Information: LDP LSP ------------------------------------------------------------------------------- No : 1 VrfIndex : Fec : 2.2.2.9/32 Nexthop : 20.1.1.1 In-Label : NULL Out-Label : 1024 In-Interface : ---------- Out-Interface : Gigabitethernet0/1/8 LspIndex : 123904 Token : 0x100800f FrrToken : 0x0 LsrType : Ingress Outgoing token : 0x0 Label Operation : PUSH Mpls-Mtu : 1500 TimeStamp : 105sec Bfd-State : --- BGPKey : --- No : 2 VrfIndex : Fec : 2.2.2.9/32 Nexthop : 20.1.1.1 In-Label : 1024 Out-Label : 1024 In-Interface : ---------- Out-Interface : Gigabitethernet0/1/8 LspIndex : 123905 Token : 0x1008010 FrrToken : 0x0 LsrType : Transit Outgoing token : 0x0 Label Operation : SWAP Mpls-Mtu : 1500 TimeStamp : 105sec Bfd-State : --- BGPKey : ---
- Establish an MP-EBGP peer relationship between the Level 2 carrier PEs to exchange VPN routes of the Level 2 carrier's customers.
# Configure PE3.
[~PE3] bgp 200 [*PE3-bgp] peer 6.6.6.9 as-number 300 [*PE3-bgp] peer 6.6.6.9 connect-interface loopback 1 [*PE3-bgp] peer 6.6.6.9 ebgp-max-hop 10 [*PE3-bgp] ipv4-family vpnv4 [*PE3-bgp-af-vpnv4] peer 6.6.6.9 enable [*PE3-bgp-af-vpnv4] commit [~PE3-bgp-af-vpnv4] quit [~PE3-bgp] quit
# Configure PE4.
[~PE4] bgp 300 [*PE4-bgp] peer 1.1.1.9 as-number 200 [*PE4-bgp] peer 1.1.1.9 connect-interface loopback 1 [*PE4-bgp] peer 1.1.1.9 ebgp-max-hop 10 [*PE4-bgp] ipv4-family vpnv4 [*PE4-bgp-af-vpnv4] peer 1.1.1.9 enable [*PE4-bgp-af-vpnv4] commit [~PE4-bgp-af-vpnv4] quit [~PE4-bgp] quit
After completing the configuration, run the display bgp vpnv4 all peer command on PE3 and PE4. The command output shows that the BGP peer relationship between the PEs of the Level 2 carriers has been established. The following example uses the command output on PE3.
[~PE3] display bgp vpnv4 all peer BGP local router ID : 1.1.1.9 Local AS number : 200 Total number of peers : 2 Peers in established state : 2 Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv 6.6.6.9 4 300 4 6 0 00:02:19 Established 2 Peer of IPv4-family for vpn instance : VPN-Instance vpn1, Router ID 1.1.1.9: 172.16.1.1 4 65410 84 79 0 01:02:32 Established 3 - Configure the Level 2 carrier's customers to access the Level 2 carrier PE.
# Configure CE3.
[~CE3] interface gigabitethernet 0/1/0 [*CE3-GigabitEthernet0/1/0] ip address 172.16.1.1 24 [*CE3-GigabitEthernet0/1/0] quit [*CE3] bgp 65410 [*CE3-bgp] peer 172.16.1.2 as-number 200 [*CE3-bgp] import-route direct [*CE3-bgp] commit [~CE3-bgp] quit
# Configure PE3.
[~PE3] ip vpn-instance vpn1 [*PE3-vpn-instance-vpn1] ipv4-family [*PE3-vpn-instance-vpn1-af-ipv4] route-distinguisher 100:1 [*PE3-vpn-instance-vpn1-af-ipv4] apply-label per-route [*PE3-vpn-instance-vpn1-af-ipv4] vpn-target 1:1 both [*PE3-vpn-instance-vpn1-af-ipv4] quit [*PE3-vpn-instance-vpn1] quit [*PE3] interface gigabitethernet 0/1/0 [*PE3-GigabitEthernet0/1/0] ip binding vpn-instance vpn1 [*PE3-GigabitEthernet0/1/0] ip address 172.16.1.2 24 [*PE3-GigabitEthernet0/1/0] quit [*PE3] bgp 200 [*PE3-bgp] ipv4-family vpn-instance vpn1 [*PE3-bgp-vpn1] peer 172.16.1.1 as-number 65410 [*PE3-bgp-vpn1] import-route direct [*PE3-bgp-vpn1] commit [~PE3-bgp-vpn1] quit [~PE3-bgp] quit
After the configuration is complete, the BGP peer relationship has been set up successfully between CE3 and PE3, and the peer status is Established.
The configurations of PE4 and CE4 are similar to those of PE3 and CE3. For configuration details, see Configuration Files in this section.
- Verify the configuration.
After all configurations are completed, run the display ip routing-table command on PE1 and PE2. The command output shows that only routes from the Level 1 carrier's network exist in the public routing tables on PE1 and PE2. The following example uses the command output on PE1.
[~PE1] display ip routing-table Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route------------------------------------------------------------------------------ Routing Table: Public Destinations : 7 Routes : 7 Destination/Mask Proto Pre Cost Flags NextHop Interface 3.3.3.9/32 Direct 0 0 D 127.0.0.1 LoopBack1 4.4.4.9/32 ISIS 15 10 D 30.1.1.2 Gigabitethernet0/1/8 30.1.1.0/24 Direct 0 0 D 30.1.1.1 Gigabitethernet0/1/8 30.1.1.1/32 Direct 0 0 D 127.0.0.1 Gigabitethernet0/1/8 30.1.1.2/32 Direct 0 0 D 30.1.1.2 Gigabitethernet0/1/8 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
Run the display ip routing-table vpn-instance command on PE1 and PE2. The command output shows that the Level 2 carriers' internal routes instead of the Level 2 carriers' external routes exist in the VPN instances of PE1 and PE2. The following example uses the command output on PE1.
[~PE1] display ip routing-table vpn-instance vpn1 Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route ------------------------------------------------------------------------------ Routing Table: vpn1 Destinations : 11 Routes : 11 Destination/Mask Proto Pre Cost Flags NextHop Interface 1.1.1.9/32 EBGP 255 10 D 11.1.1.1 Gigabitethernet0/1/0 2.2.2.9/32 EBGP 255 0 D 11.1.1.1 Gigabitethernet0/1/0 5.5.5.9/32 IBGP 255 0 RD 4.4.4.9 Gigabitethernet0/1/8 6.6.6.9/32 IBGP 255 10 RD 4.4.4.9 Gigabitethernet0/1/8 40.1.1.0/24 EBGP 255 0 D 11.1.1.1 Gigabitethernet0/1/0 11.1.1.0/24 Direct 0 0 D 11.1.1.2 Gigabitethernet0/1/0 11.1.1.1/32 Direct 0 0 D 11.1.1.1 Gigabitethernet0/1/0 11.1.1.2/32 Direct 0 0 D 127.0.0.1 Gigabitethernet0/1/0 20.1.1.0/24 IBGP 255 0 RD 4.4.4.9 Gigabitethernet0/1/8 21.1.1.0/24 IBGP 255 0 RD 4.4.4.9 Gigabitethernet0/1/8 21.1.1.2/32 IBGP 255 0 RD 4.4.4.9 Gigabitethernet0/1/8
Run the display ip routing-table command on CE1 and CE2. The command output shows that the Level 2 carriers' internal routes instead of the Level 2 carriers' external routes exist in the public routing tables of CE1 and CE2. The following example uses the command output on CE1.
[~CE1] display ip routing-table Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route ------------------------------------------------------------------------------ Routing Table: Public Destinations : 15 Routes : 15 Destination/Mask Proto Pre Cost Flags NextHop Interface 1.1.1.9/32 OSPF 10 1 D 40.1.1.1 Gigabitethernet0/1/0 2.2.2.9/32 Direct 0 0 D 127.0.0.1 LoopBack1 5.5.5.9/32 EBGP 255 0 D 11.1.1.2 Gigabitethernet0/1/8 6.6.6.9/32 EBGP 255 0 D 11.1.1.2 Gigabitethernet0/1/8 40.1.1.0/24 Direct 0 0 D 40.1.1.2 Gigabitethernet0/1/0 40.1.1.1/32 Direct 0 0 D 40.1.1.1 Gigabitethernet0/1/0 40.1.1.2/32 Direct 0 0 D 127.0.0.1 Gigabitethernet0/1/0 11.1.1.0/24 Direct 0 0 D 11.1.1.1 Gigabitethernet0/1/8 11.1.1.1/32 Direct 0 0 D 127.0.0.1 Gigabitethernet0/1/8 11.1.1.2/32 Direct 0 0 D 11.1.1.2 Gigabitethernet0/1/8 20.1.1.0/24 EBGP 255 0 D 11.1.1.2 Gigabitethernet0/1/8 21.1.1.0/24 EBGP 255 0 D 11.1.1.2 Gigabitethernet0/1/8 21.1.1.2/32 EBGP 255 0 D 11.1.1.2 Gigabitethernet0/1/8 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
Run the display ip routing-table vpn-instance command on PE3 and PE4. The command output shows that the Level 2 carriers' external routes exist in the VPN instances of PE3 and PE4. The following example uses the command output on PE3.
[~PE3] display ip routing-table vpn-instance vpn1 Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route ------------------------------------------------------------------------------ Routing Table: vpn1 Destinations : 3 Routes : 3 Destination/Mask Proto Pre Cost Flags NextHop Interface 172.16.1.0/24 Direct 0 0 D 172.16.1.2 GigabitEthernet0/1/0 172.16.1.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/1/0 172.16.2.0/24 EBGP 255 0 RD 6.6.6.9 Gigabitethernet0/1/8
PE3 and PE4 can ping each other.
[~PE3] ping 20.1.1.2 PING 20.1.1.2: 56 data bytes, press CTRL_C to break Reply from 20.1.1.2: bytes=56 Sequence=1 ttl=251 time=116 ms Reply from 20.1.1.2: bytes=56 Sequence=2 ttl=251 time=92 ms Reply from 20.1.1.2: bytes=56 Sequence=3 ttl=251 time=118 ms Reply from 20.1.1.2: bytes=56 Sequence=4 ttl=251 time=103 ms Reply from 20.1.1.2: bytes=56 Sequence=5 ttl=251 time=121 ms --- 20.1.1.2 ping statistics --- 5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 92/110/121 msCE3 and CE4 can ping each other.
[~CE3] ping 172.16.2.1 PING 172.16.2.1: 56 data bytes, press CTRL_C to break Reply from 172.16.2.1: bytes=56 Sequence=1 ttl=251 time=65 ms Reply from 172.16.2.1: bytes=56 Sequence=2 ttl=251 time=114 ms Reply from 172.16.2.1: bytes=56 Sequence=3 ttl=251 time=80 ms Reply from 172.16.2.1: bytes=56 Sequence=4 ttl=251 time=88 ms Reply from 172.16.2.1: bytes=56 Sequence=5 ttl=251 time=105 ms --- 172.16.2.1 ping statistics --- 5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 65/90/114 ms
Configuration Files
CE3 configuration file
# sysname CE3 # interface GigabitEthernet0/1/0 undo shutdown ip address 172.16.1.1 255.255.255.0 # bgp 65410 peer 172.16.1.2 as-number 200 # ipv4-family unicast undo synchronization import-route direct peer 172.16.1.2 enable # ReturnPE3 configuration file
# sysname PE3 # ip vpn-instance vpn1 ipv4-family route-distinguisher 100:1 apply-label per-route vpn-target 1:1 export-extcommunity vpn-target 1:1 import-extcommunity # mpls lsr-id 1.1.1.9 # mpls # mpls ldp # interface GigabitEthernet0/1/0 undo shutdown ip binding vpn-instance vpn1 ip address 172.16.1.2 255.255.255.0 # interface Gigabitethernet0/1/8 undo shutdown ip address 40.1.1.1 255.255.255.0 mpls mpls ldp # interface LoopBack1 ip address 1.1.1.9 255.255.255.255 # bgp 200 peer 6.6.6.9 as-number 300 peer 6.6.6.9 ebgp-max-hop 10 peer 6.6.6.9 connect-interface LoopBack1 # ipv4-family unicast undo synchronization peer 6.6.6.9 enable # ipv4-family vpnv4 policy vpn-target peer 6.6.6.9 enable # ipv4-family vpn-instance vpn1 import-route direct peer 172.16.1.1 as-number 65410 # ospf 1 area 0.0.0.0 network 1.1.1.9 0.0.0.0 network 40.1.1.0 0.0.0.255 # return
CE1 configuration file
# sysname CE1 # mpls lsr-id 2.2.2.9 mpls lsp-trigger bgp-label-route # mpls ldp # interface Gigabitethernet0/1/0 undo shutdown ip address 40.1.1.2 255.255.255.0 mpls mpls ldp # interface Gigabitethernet0/1/8 undo shutdown ip address 11.1.1.1 255.255.255.0 mpls # interface LoopBack1 ip address 2.2.2.9 255.255.255.255 # bgp 200 peer 11.1.1.2 as-number 100 # ipv4-family unicast undo synchronization import-route ospf 1 peer 11.1.1.2 enable peer 11.1.1.2 route-policy policy1 export peer 11.1.1.2 label-route-capability # ospf 1 import-route bgp area 0.0.0.0 network 2.2.2.9 0.0.0.0 network 40.1.1.0 0.0.0.255 network 11.1.1.0 0.0.0.255 # route-policy policy1 permit node 1 apply mpls-label # return
PE1 configuration file
# sysname PE1 # ip vpn-instance vpn1 ipv4-family route-distinguisher 200:1 apply-label per-route vpn-target 1:1 export-extcommunity vpn-target 1:1 import-extcommunity # mpls lsr-id 3.3.3.9 # mpls # mpls ldp # isis 1 network-entity 10.0000.0000.0004.00 # interface Gigabitethernet0/1/0 undo shutdown ip binding vpn-instance vpn1 ip address 11.1.1.2 255.255.255.0 mpls # interface Gigabitethernet0/1/8 undo shutdown ip address 30.1.1.1 255.255.255.0 isis enable 1 mpls mpls ldp # interface LoopBack1 ip address 3.3.3.9 255.255.255.255 isis enable 1 # bgp 100 peer 4.4.4.9 as-number 100 peer 4.4.4.9 connect-interface LoopBack1 # ipv4-family unicast undo synchronization peer 4.4.4.9 enable # ipv4-family vpnv4 policy vpn-target peer 4.4.4.9 enable # ipv4-family vpn-instance vpn1 import-route direct peer 11.1.1.1 as-number 200 peer 11.1.1.1 route-policy policy1 export peer 11.1.1.1 label-route-capability # ospf 1 area 0.0.0.0 network 3.3.3.9 0.0.0.0 network 11.1.1.0 0.0.0.255 # route-policy policy1 permit node 1 apply mpls-label # return
PE2 configuration file
# sysname PE2 # ip vpn-instance vpn1 ipv4-family route-distinguisher 200:2 apply-label per-route vpn-target 1:1 export-extcommunity vpn-target 1:1 import-extcommunity # mpls lsr-id 4.4.4.9 # mpls # mpls ldp # isis 1 network-entity 10.0000.0000.0005.00 # interface Gigabitethernet0/1/0 undo shutdown ip address 30.1.1.2 255.255.255.0 isis enable 1 mpls mpls ldp # interface Gigabitethernet0/1/8 undo shutdown ip binding vpn-instance vpn1 ip address 21.1.1.1 255.255.255.0 mpls # interface LoopBack1 ip address 4.4.4.9 255.255.255.255 isis enable 1 # bgp 100 peer 3.3.3.9 as-number 100 peer 3.3.3.9 connect-interface LoopBack1 # ipv4-family unicast undo synchronization peer 3.3.3.9 enable # ipv4-family vpnv4 policy vpn-target peer 3.3.3.9 enable # ipv4-family vpn-instance vpn1 import-route direct peer 21.1.1.2 as-number 300 peer 21.1.1.2 route-policy policy1 export peer 21.1.1.2 label-route-capability # ospf 1 area 0.0.0.0 network 4.4.4.9 0.0.0.0 network 21.1.1.0 0.0.0.255 # route-policy policy1 permit node 1 apply mpls-label # return
CE2 configuration file
# sysname CE2 # mpls lsr-id 5.5.5.9 mpls lsp-trigger bgp-label-route # mpls ldp # interface Gigabitethernet0/1/0 undo shutdown ip address 21.1.1.2 255.255.255.0 mpls # interface Gigabitethernet0/1/8 undo shutdown ip address 20.1.1.1 255.255.255.0 mpls mpls ldp # interface LoopBack1 ip address 5.5.5.9 255.255.255.255 # bgp 300 peer 21.1.1.1 as-number 100 # ipv4-family unicast undo synchronization import-route ospf 1 peer 21.1.1.1 enable peer 21.1.1.1 route-policy policy1 export peer 21.1.1.1 label-route-capability # ospf 1 import-route bgp area 0.0.0.0 network 5.5.5.9 0.0.0.0 network 20.1.1.0 0.0.0.255 network 21.1.1.0 0.0.0.255 # route-policy policy1 permit node 1 apply mpls-label # return
PE4 configuration file
# sysname PE4 # ip vpn-instance vpn1 ipv4-family route-distinguisher 100:2 apply-label per-route vpn-target 1:1 export-extcommunity vpn-target 1:1 import-extcommunity # mpls lsr-id 6.6.6.9 # mpls # mpls ldp # interface GigabitEthernet0/1/0 undo shutdown ip binding vpn-instance vpn1 ip address 172.16.2.2 255.255.255.0 # interface Gigabitethernet0/1/0 undo shutdown ip address 20.1.1.2 255.255.255.0 mpls mpls ldp # interface LoopBack1 ip address 6.6.6.9 255.255.255.255 # bgp 300 peer 1.1.1.9 as-number 200 peer 1.1.1.9 ebgp-max-hop 10 peer 1.1.1.9 connect-interface LoopBack1 # ipv4-family unicast undo synchronization peer 1.1.1.9 enable # ipv4-family vpnv4 policy vpn-target peer 1.1.1.9 enable # ipv4-family vpn-instance vpn1 import-route direct peer 172.16.2.1 as-number 65420 # ospf 1 area 0.0.0.0 network 6.6.6.9 0.0.0.0 network 20.1.1.0 0.0.0.255 # return
CE4 configuration file
# sysname CE4 # interface GigabitEthernet0/1/0 undo shutdown ip address 172.16.2.1 255.255.255.0 # bgp 65420 peer 172.16.2.2 as-number 300 # ipv4-family unicast undo synchronization import-route direct peer 172.16.2.2 enable # return