Example for Configuring an RSVP-TE Tunnel
Networking Requirements
On the network shown in Figure 1, LSRA, LSRB, LSRC, and LSRD are level-2 routers that run IS-IS.
RSVP-TE is used to establish a TE tunnel with 20 Mbit/s bandwidth between LSRA and LSRD. The maximum reservable bandwidth for every link along the TE tunnel is 100 Mbit/s and the BC0 bandwidth is 100 Mbit/s.
Configuration Roadmap
The configuration roadmap is as follows:
Assign an IP address to each interface, including the loopback interface whose address is to be used as an LSR ID on each involved node.
Enable IS-IS globally; configure the network entity name; set the cost type to enable IS-IS TE; enable IS-IS on involved interfaces, including loopback interfaces.
Set an MPLS LSR ID for every LSR and enable MPLS, MPLS TE, RSVP-TE, and CSPF globally.
Enable MPLS, MPLS TE, and RSVP-TE on every interface.
Configure the maximum reservable link bandwidth and BC bandwidth on the outbound interfaces of each involved tunnel.
Create a tunnel interface on the ingress and configure the source and destination IP addresses for the tunnel, tunnel protocol, destination address, and tunnel bandwidth.
Data Preparation
To complete the configuration, you need the following data:
Origin AS number, IS-IS level, and area ID of every LSR
BC bandwidth and maximum reservable bandwidth on every link along the TE tunnel
Tunnel interface number, IP address, destination IP address, tunnel ID, and tunnel bandwidth
Procedure
- Assign an IP address and its mask to every interface.
Assign an IP address and a mask to each interface according to Figure 1. The configuration details are not provided.
- Configure IS-IS.
# Configure LSRA.
[~LSRA] isis 1 [*LSRA-isis-1] network-entity 00.0005.0000.0000.0001.00 [*LSRA-isis-1] is-level level-2 [*LSRA-isis-1] quit [*LSRA] interface gigabitethernet 0/1/0 [*LSRA-GigabitEthernet0/1/0] isis enable 1 [*LSRA-GigabitEthernet0/1/0] quit [*LSRA] interface loopback 1 [*LSRA-LoopBack1] isis enable 1 [*LSRA-LoopBack1] commit [~LSRA-LoopBack1] quit
# Configure LSRB.
[~LSRB] isis 1 [*LSRB-isis-1] network-entity 00.0005.0000.0000.0002.00 [*LSRB-isis-1] is-level level-2 [*LSRB-isis-1] quit [*LSRB] interface gigabitethernet 0/1/0 [*LSRB-GigabitEthernet0/1/0] isis enable 1 [*LSRB-GigabitEthernet0/1/0] quit [*LSRB] interface gigabitethernet 0/1/8 [*LSRB-GigabitEthernet0/1/8] isis enable 1 [*LSRB-GigabitEthernet0/1/8] quit [*LSRB] interface loopback 1 [*LSRB-LoopBack1] isis enable 1 [*LSRB-LoopBack1] commit [~LSRB-LoopBack1] quit
# Configure LSRC.
[~LSRC] isis 1 [*LSRC-isis-1] network-entity 00.0005.0000.0000.0003.00 [*LSRC-isis-1] is-level level-2 [*LSRC-isis-1] quit [*LSRC] interface gigabitethernet 0/1/0 [*LSRC-GigabitEthernet0/1/0] isis enable 1 [*LSRC-GigabitEthernet0/1/0] quit [*LSRC] interface gigabitethernet 0/1/8 [*LSRC-GigabitEthernet0/1/8] isis enable 1 [*LSRC-GigabitEthernet0/1/8] quit [*LSRC] interface loopback 1 [*LSRC-LoopBack1] isis enable 1 [*LSRC-LoopBack1] commit [~LSRC-LoopBack1] quit
# Configure LSRD.
[~LSRD] isis 1 [*LSRD-isis-1] network-entity 00.0005.0000.0000.0004.00 [*LSRD-isis-1] is-level level-2 [*LSRD-isis-1] quit [*LSRD] interface gigabitethernet 0/1/0 [*LSRD-GigabitEthernet0/1/0] isis enable 1 [*LSRD-GigabitEthernet0/1/0] quit [*LSRD] interface loopback 1 [*LSRD-LoopBack1] isis enable 1 [*LSRD-LoopBack1] commit [~LSRD-LoopBack1] quit
After completing the configurations, run the display ip routing-table command on each node. All nodes have learned routes from one another. The following example uses the command output on LSRA.
[~LSRA] display ip routing-table Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route ------------------------------------------------------------------------------ Routing Table : _public_ Destinations : 13 Routes : 13 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 ISIS-L2 15 10 D 10.1.1.2 GigabitEthernet0/1/0 3.3.3.9/32 ISIS-L2 15 20 D 10.1.1.2 GigabitEthernet0/1/0 4.4.4.9/32 ISIS-L2 15 30 D 10.1.1.2 GigabitEthernet0/1/0 10.1.1.0/24 Direct 0 0 D 10.1.1.1 GigabitEthernet0/1/0 10.1.1.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/1/0 10.1.1.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/1/0 10.2.1.0/24 ISIS-L2 15 20 D 10.1.1.2 GigabitEthernet0/1/0 10.3.1.0/24 ISIS-L2 15 30 D 10.1.1.2 GigabitEthernet0/1/0 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0 255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
- Configure basic MPLS functions and enable MPLS TE, RSVP-TE, and CSPF.
# Enable MPLS, MPLS TE, and RSVP-TE globally on each node and on all interfaces along the tunnel, and enable CSPF on the ingress.
# Configure LSRA.
[~LSRA] mpls lsr-id 1.1.1.9 [*LSRA] mpls [*LSRA-mpls] mpls te [*LSRA-mpls] mpls rsvp-te [*LSRA-mpls] mpls te cspf [*LSRA-mpls] quit [*LSRA] interface gigabitethernet 0/1/0 [*LSRA-GigabitEthernet0/1/0] mpls [*LSRA-GigabitEthernet0/1/0] mpls te [*LSRA-GigabitEthernet0/1/0] mpls rsvp-te [*LSRA-GigabitEthernet0/1/0] commit [~LSRA-GigabitEthernet0/1/0] quit
# Configure LSRB.
[~LSRB] mpls lsr-id 2.2.2.9 [*LSRB] mpls [*LSRB-mpls] mpls te [*LSRB-mpls] mpls rsvp-te [*LSRB-mpls] quit [*LSRB] interface gigabitethernet 0/1/0 [*LSRB-GigabitEthernet0/1/0] mpls [*LSRB-GigabitEthernet0/1/0] mpls te [*LSRB-GigabitEthernet0/1/0] mpls rsvp-te [*LSRB-GigabitEthernet0/1/0] quit [*LSRB] interface gigabitethernet 0/1/8 [*LSRB-GigabitEthernet0/1/8] mpls [*LSRB-GigabitEthernet0/1/8] mpls te [*LSRB-GigabitEthernet0/1/8] mpls rsvp-te [*LSRB-GigabitEthernet0/1/8] commit [~LSRB-GigabitEthernet0/1/8] quit
# Configure LSRC.
[~LSRC] mpls lsr-id 3.3.3.9 [*LSRC] mpls [*LSRC-mpls] mpls te [*LSRC-mpls] mpls rsvp-te [*LSRC-mpls] quit [*LSRC] interface gigabitethernet 0/1/0 [*LSRC-GigabitEthernet0/1/0] mpls [*LSRC-GigabitEthernet0/1/0] mpls te [*LSRC-GigabitEthernet0/1/0] mpls rsvp-te [*LSRC-GigabitEthernet0/1/0] quit [*LSRC] interface gigabitethernet 0/1/8 [*LSRC-GigabitEthernet0/1/8] mpls [*LSRC-GigabitEthernet0/1/8] mpls te [*LSRC-GigabitEthernet0/1/8] mpls rsvp-te [*LSRC-GigabitEthernet0/1/8] commit [~LSRC-GigabitEthernet0/1/8] quit
# Configure LSRD.
[~LSRD] mpls lsr-id 4.4.4.9 [*LSRD] mpls [*LSRD-mpls] mpls te [*LSRD-mpls] mpls rsvp-te [*LSRD-mpls] quit [*LSRD] interface gigabitethernet 0/1/0 [*LSRD-GigabitEthernet0/1/0] mpls [*LSRD-GigabitEthernet0/1/0] mpls te [*LSRD-GigabitEthernet0/1/0] mpls rsvp-te [*LSRD-GigabitEthernet0/1/0] commit [~LSRD-GigabitEthernet0/1/0] quit
- Configure IS-IS TE.
# Configure LSRA.
[~LSRA] isis 1 [~LSRA-isis-1] cost-style wide [*LSRA-isis-1] traffic-eng level-2 [*LSRA-isis-1] commit [~LSRA-isis-1] quit
# Configure LSRB.
[~LSRB] isis 1 [~LSRB-isis-1] cost-style wide [*LSRB-isis-1] traffic-eng level-2 [*LSRB-isis-1] commit [~LSRB-isis-1] quit
# Configure LSRC.
[~LSRC] isis 1 [~LSRC-isis-1] cost-style wide [*LSRC-isis-1] traffic-eng level-2 [*LSRC-isis-1] commit [~LSRC-isis-1] quit
# Configure LSRD.
[~LSRD] isis 1 [~LSRD-isis-1] cost-style wide [*LSRD-isis-1] traffic-eng level-2 [*LSRD-isis-1] commit [~LSRD-isis-1] quit
- Set MPLS TE bandwidth attributes for links.
# Set the maximum reservable bandwidth and BC0 bandwidth for a link on every interface along the TE tunnel.
# Configure LSRA.
[~LSRA] interface gigabitethernet 0/1/0 [~LSRA-GigabitEthernet0/1/0] mpls te bandwidth max-reservable-bandwidth 100000 [*LSRA-GigabitEthernet0/1/0] mpls te bandwidth bc0 100000 [*LSRA-GigabitEthernet0/1/0] commit [~LSRA-GigabitEthernet0/1/0] quit
# Configure LSRB.
[~LSRB] interface gigabitethernet 0/1/8 [~LSRB-GigabitEthernet0/1/8] mpls te bandwidth max-reservable-bandwidth 100000 [*LSRB-GigabitEthernet0/1/8] mpls te bandwidth bc0 100000 [*LSRB-GigabitEthernet0/1/8] commit [~LSRB-GigabitEthernet0/1/8] quit
# Configure LSRC.
[~LSRC] interface gigabitethernet 0/1/0 [~LSRC-GigabitEthernet0/1/0] mpls te bandwidth max-reservable-bandwidth 100000 [*LSRC-GigabitEthernet0/1/0] mpls te bandwidth bc0 100000 [*LSRC-GigabitEthernet0/1/0] commit [~LSRC-GigabitEthernet0/1/0] quit
- Configure an MPLS TE tunnel interface.
# Create a tunnel interface on the ingress; configure the source and destination IP addresses for the tunnel, tunnel protocol, tunnel ID, and RSVP-TE signaling protocol; run the commit command to make the configurations take effect.
# Configure LSRA.
[~LSRA] interface tunnel 1 [*LSRA-Tunnel1] ip address unnumbered interface loopback 1 [*LSRA-Tunnel1] tunnel-protocol mpls te [*LSRA-Tunnel1] destination 4.4.4.9 [*LSRA-Tunnel1] mpls te tunnel-id 1 [*LSRA-Tunnel1] mpls te bandwidth ct0 20000 [*LSRA-Tunnel1] commit [~LSRA-Tunnel1] quit
- Verify the configuration.
After completing the configuration, run the display interface tunnel command on LSRA. The tunnel interface is Up.
[~LSRA] display interface tunnel 1 Tunnel1 current state : Up (ifindex: 29) Line protocol current state : Up Last line protocol up time : 2012-11-30 05:58:08 Description: Route Port,The Maximum Transmit Unit is 1500, Current BW: 20Mbps Internet Address is unnumbered, using address of LoopBack1(1.1.1.9/32) Encapsulation is TUNNEL, loopback not set Tunnel destination 4.4.4.9 Tunnel up/down statistics 1 Tunnel protocol/transport MPLS/MPLS, ILM is available, primary tunnel id is 0x61, secondary tunnel id is 0x0 Current system time: 2012-11-30 05:58:10 300 seconds output rate 0 bits/sec, 0 packets/sec 0 seconds output rate 0 bits/sec, 0 packets/sec 126 packets output, 34204 bytes 0 output error 18 output drop Last 300 seconds input utility rate: 0.00% Last 300 seconds output utility rate: 0.00%
Run the display mpls te tunnel-interface command on LSRA. Detailed information about the tunnel interface is displayed.
[~LSRA] display mpls te tunnel-interface tunnel1 Tunnel Name : Tunnel1 Signalled Tunnel Name: - Tunnel State Desc : CR-LSP is Up Tunnel Attributes : Active LSP : Primary LSP Traffic Switch : - Session ID : 1 Ingress LSR ID : 1.1.1.9 Egress LSR ID: 4.4.4.9 Admin State : UP Oper State : UP Signaling Protocol : RSVP FTid : 1 Tie-Breaking Policy : None Metric Type : None Bfd Cap : None Reopt : Disabled Reopt Freq : - Inter-area Reopt : Disabled Auto BW : Disabled Threshold : 0 percent Current Collected BW: 0 kbps Auto BW Freq : 0 Min BW : 0 kbps Max BW : 0 kbps Offload : Disabled Offload Freq : - Low Value : - High Value : - Readjust Value : - Offload Explicit Path Name: Tunnel Group : - Interfaces Protected: - Excluded IP Address : - Referred LSP Count : 0 Primary Tunnel : - Pri Tunn Sum : - Backup Tunnel : - Group Status : Up Oam Status : - IPTN InLabel : - Tunnel BFD Status : - BackUp LSP Type : None BestEffort : Enabled Secondary HopLimit : - BestEffort HopLimit : - Secondary Explicit Path Name: - Secondary Affinity Prop/Mask: 0x0/0x0 BestEffort Affinity Prop/Mask: 0x0/0x0 IsConfigLspConstraint: - Hot-Standby Revertive Mode: Revertive Hot-Standby Overlap-path: Disabled Hot-Standby Switch State: CLEAR Bit Error Detection: Disabled Bit Error Detection Switch Threshold: - Bit Error Detection Resume Threshold: - Ip-Prefix Name : - P2p-Template Name : - PCE Delegate : No LSP Control Status : Local control Path Verification : -- Entropy Label : None Auto BW Remain Time : 200 s Reopt Remain Time : 100 s Metric Inherit IGP : None Binding Sid : - Reverse Binding Sid : - Self-Ping : Disable Self-Ping Duration : 1800 sec FRR Attr Source : - Is FRR degrade down : No Primary LSP ID : 1.1.1.9:19 LSP State : UP LSP Type : Primary Setup Priority : 7 Hold Priority: 7 IncludeAll : 0x0 IncludeAny : 0x0 ExcludeAny : 0x0 Affinity Prop/Mask : 0x0/0x0 Resv Style : SE Configured Bandwidth Information: CT0 Bandwidth(Kbit/sec): 10000 CT1 Bandwidth(Kbit/sec): 0 CT2 Bandwidth(Kbit/sec): 0 CT3 Bandwidth(Kbit/sec): 0 CT4 Bandwidth(Kbit/sec): 0 CT5 Bandwidth(Kbit/sec): 0 CT6 Bandwidth(Kbit/sec): 0 CT7 Bandwidth(Kbit/sec): 0 Actual Bandwidth Information: CT0 Bandwidth(Kbit/sec): 10000 CT1 Bandwidth(Kbit/sec): 0 CT2 Bandwidth(Kbit/sec): 0 CT3 Bandwidth(Kbit/sec): 0 CT4 Bandwidth(Kbit/sec): 0 CT5 Bandwidth(Kbit/sec): 0 CT6 Bandwidth(Kbit/sec): 0 CT7 Bandwidth(Kbit/sec): 0 Explicit Path Name : main Hop Limit: - Record Route : Disabled Record Label : Disabled Route Pinning : Disabled FRR Flag : Disabled IdleTime Remain : - BFD Status : - Soft Preemption : Enabled Reroute Flag : Disabled Pce Flag : Normal Path Setup Type : CSPF Create Modify LSP Reason: - Self-Ping Status : -
Run the display mpls te cspf tedb all command on LSRA. Link information in the TEDB is displayed.
[~LSRA] display mpls te cspf tedb all Current Total Node Number: 4 Current Total Link Number: 6 Current Total SRLG Number: 0 Id Router-Id IGP Process-Id Area Link-Count 1 1.1.1.9 ISIS 1 Level-2 1 2 2.2.2.9 ISIS 1 Level-2 2 3 3.3.3.9 ISIS 1 Level-2 2 4 4.4.4.9 ISIS 1 Level-2 1
Configuration Files
LSRA configuration file
# sysname LSRA # mpls lsr-id 1.1.1.9 # mpls mpls te mpls te cspf mpls rsvp-te # isis 1 is-level level-2 cost-style wide traffic-eng level-2 network-entity 00.0005.0000.0000.0001.00 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.1.1.1 255.255.255.0 mpls mpls te mpls te bandwidth max-reservable-bandwidth 100000 mpls te bandwidth bc0 100000 isis enable 1 mpls rsvp-te # interface LoopBack1 ip address 1.1.1.9 255.255.255.255 isis enable 1 # interface Tunnel1 ip address unnumbered interface LoopBack1 tunnel-protocol mpls te destination 4.4.4.9 mpls te bandwidth ct0 20000 mpls te tunnel-id 1 # returnLSRB configuration file
# sysname LSRB # mpls lsr-id 2.2.2.9 # mpls mpls te mpls rsvp-te # isis 1 is-level level-2 cost-style wide traffic-eng level-2 network-entity 00.0005.0000.0000.0002.00 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.1.1.2 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface GigabitEthernet0/1/8 undo shutdown ip address 10.2.1.1 255.255.255.0 mpls mpls te mpls te bandwidth max-reservable-bandwidth 100000 mpls te bandwidth bc0 100000 isis enable 1 mpls rsvp-te # interface LoopBack1 ip address 2.2.2.9 255.255.255.255 isis enable 1 # return
LSRC configuration file
#
sysname LSRC # mpls lsr-id 3.3.3.9 # mpls mpls te mpls rsvp-te # isis 1 is-level level-2 cost-style wide traffic-eng level-2 network-entity 00.0005.0000.0000.0003.00 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.3.1.1 255.255.255.0 mpls mpls te mpls te bandwidth max-reservable-bandwidth 100000 mpls te bandwidth bc0 100000 isis enable 1 mpls rsvp-te # interface GigabitEthernet0/1/8 undo shutdown ip address 10.2.1.2 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface LoopBack1 ip address 3.3.3.9 255.255.255.255 isis enable 1 # return
LSRD configuration file
# sysname LSRD # mpls lsr-id 4.4.4.9 # mpls mpls te mpls rsvp-te # isis 1 is-level level-2 cost-style wide traffic-eng level-2 network-entity 00.0005.0000.0000.0004.00 # interface GigabitEthernet0/1/0 undo shutdown ip address 10.3.1.2 255.255.255.0 mpls mpls te isis enable 1 mpls rsvp-te # interface LoopBack1 ip address 4.4.4.9 255.255.255.255 isis enable 1 # return