Example for Configuring the Threshold for Flooding Bandwidth Information
Networking Requirements
On the network shown in Figure 1, an RSVP-TE tunnel between LSRA and LSRD is established. The bandwidth is 50 Mbit/s. The maximum reservable bandwidth and BC0 bandwidth for every link are 100 Mbit/s. The RDM is used.
The threshold for flooding bandwidth information is set to 20%. This reduces the number of attempts to flood bandwidth information and saves network resources. If the proportion of the bandwidth used or released by an MPLS TE tunnel to the available bandwidth in the TEDB is greater than or equal to 20%, an IGP floods the bandwidth information, and CSPF updates TEDB information.
Configuration Roadmap
The configuration roadmap is as follows:
Configure an RSVP-TE tunnel. See "Configuration Roadmap" in Example for Configuring an RSVP-TE Tunnel.
Configure bandwidth and the threshold for flooding bandwidth information
Data Preparation
To complete the configuration, you need the following data:
OSPF process ID and area ID for every LSR
Maximum reservable bandwidth and BC bandwidth for every link along the TE tunnel
Tunnel interface number, source and destination addresses, ID, and RSVP-TE signaling protocol of the tunnel
Threshold for flooding bandwidth information
Procedure
- Assign an IP address and its mask to every interface.
Assign an IP address and its mask to every physical interface and configure a loopback interface address as an LSR ID on every node according to Figure 1.
For configuration details, see Configuration Files in this section.
- Configure an IGP.
Configure OSPF or IS-IS on every node to implement connectivity between them. IS-IS is used in this example.
For configuration details, see Configuration Files in this section.
- Configure basic MPLS functions and enable MPLS TE, RSVP-TE, and CSPF.
# Enable MPLS, MPLS TE, and RSVP-TE on every LSR and their interfaces along a tunnel, and enable CSPF in the system view of the ingress.
For configuration details, see Configuration Files in this section.
- Set MPLS TE bandwidth for links.
# Set the maximum reservable bandwidth and BC0 bandwidth for a link on every interface along the TE tunnel.
For configuration details, see Configuration Files in this section.
- Configure the threshold for flooding bandwidth information.
# Set the threshold for flooding bandwidth information to 20% on a physical interface on LSRA. If the proportion of the bandwidth used or released by an MPLS TE tunnel to the available bandwidth in the TEDB is greater than or equal to 20%, an IGP floods the bandwidth information, and CSPF updates TEDB information.
[~LSRA] interface gigabitethernet 0/1/0 [~LSRA-GigabitEthernet0/1/0] mpls te bandwidth change thresholds up 20 [*LSRA-GigabitEthernet0/1/0] mpls te bandwidth change thresholds down 20 [*LSRA-GigabitEthernet0/1/0] commit [~LSRA-GigabitEthernet0/1/0] quit
Run the display mpls te cspf tedb command on LSRA. TEDB information is displayed.
[~LSRA] display mpls te cspf tedb interface 10.1.1.1 Router ID: 1.1.1.9 IGP Type: ISIS Process Id: 1 Link[1]: ISIS System ID: 0000.0000.0001.00 Opaque LSA ID: 0000.0000.0001.00:00 Interface IP Address: 10.1.1.1 DR Address: 10.1.1.1 DR ISIS System ID: 0000.0000.0001.01 IGP Area: Level-2 Link Type: Multi-access Link Status: Active IGP Metric: 10 TE Metric: 10 Color: 0x0 Bandwidth Allocation Model : - Maximum Link-Bandwidth: 100000 (kbps) Maximum Reservable Bandwidth: 100000 (kbps) Operational Mode of Router : TE Bandwidth Constraints: Local Overbooking Multiplier: BC[0]: 100000 (kbps) LOM[0]: 1 BW Unreserved: Class ID: [0]: 100000 (kbps), [1]: 100000 (kbps) [2]: 100000 (kbps), [3]: 100000 (kbps) [4]: 100000 (kbps), [5]: 100000 (kbps) [6]: 100000 (kbps), [7]: 100000 (kbps) - Configure an MPLS TE tunnel.
# Configure a tunnel named Tunnel1 on LSRA.
[~LSRA]interface tunnel 1 [*LSRA-Tunnel1] ip address unnumbered interface loopback 1 [*LSRA-Tunnel1] destination 4.4.4.9 [*LSRA-Tunnel1] tunnel-protocol mpls te [*LSRA-Tunnel1] mpls te bandwidth ct0 10000 [*LSRA-Tunnel1] mpls te tunnel-id 1 [*LSRA-Tunnel1] commit [~LSRA-Tunnel1] quit
After completing the configuration, run the display mpls te tunnel-interface command on LSRA. The tunnel interface is Up.
[~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 : - 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 command on LSRA. Bandwidth information is unchanged.
[~LSRA] display mpls te cspf tedb interface 10.1.1.1 Router ID: 1.1.1.9 IGP Type: ISIS Process Id: 1 Link[1]: ISIS System ID: 0000.0000.0001.00 Opaque LSA ID: 0000.0000.0001.00:00 Interface IP Address: 10.1.1.1 DR Address: 10.1.1.1 DR ISIS System ID: 0000.0000.0001.01 IGP Area: Level-2 Link Type: Multi-access Link Status: Active IGP Metric: 10 TE Metric: 10 Color: 0x0 Bandwidth Allocation Model : - Maximum Link-Bandwidth: 100000 (kbps) Maximum Reservable Bandwidth: 100000 (kbps) Operational Mode of Router : TE Bandwidth Constraints: Local Overbooking Multiplier: BC[0]: 100000 (kbps) LOM[0]: 1 BW Unreserved: Class ID: [0]: 100000 (kbps), [1]: 100000 (kbps) [2]: 100000 (kbps), [3]: 100000 (kbps) [4]: 100000 (kbps), [5]: 100000 (kbps) [6]: 100000 (kbps), [7]: 100000 (kbps) - Verify the configuration.
After completing the configuration, change the bandwidth to 20000 kbit/s.
[~LSRA] interface tunnel 1 [~LSRA-Tunnel1] mpls te bandwidth ct0 20000 [*LSRA-Tunnel1] commit [~LSRA-Tunnel1] quit
Run the display mpls te cspf tedb interface 10.1.1.1 command on LSRA. TEDB information shows that the TE tunnel named Tunnel1 has been reestablished successfully. Its bandwidth is 20 kbit/s, reaching 20%, the threshold for flooding bandwidth information. Therefore, CSPF TEDB information has been updated.
[~LSRA] display mpls te cspf tedb interface 10.1.1.1 Router ID: 1.1.1.9 IGP Type: ISIS Process Id: 1 Link[1]: ISIS System ID: 0000.0000.0001.00 Opaque LSA ID: 0000.0000.0001.00:00 Interface IP Address: 10.1.1.1 DR Address: 10.1.1.1 DR ISIS System ID: 0000.0000.0001.01 IGP Area: Level-2 Link Type: Multi-access Link Status: Active IGP Metric: 10 TE Metric: 10 Color: 0x0 Bandwidth Allocation Model : - Maximum Link-Bandwidth: 100000 (kbps) Maximum Reservable Bandwidth: 100000 (kbps) Operational Mode of Router : TE Bandwidth Constraints: Local Overbooking Multiplier: BC[0]: 100000 (kbps) LOM[0]: 1 BW Unreserved: Class ID: [0]: 100000 (kbps), [1]: 100000 (kbps) [2]: 100000 (kbps), [3]: 100000 (kbps) [4]: 100000 (kbps), [5]: 100000 (kbps) [6]: 100000 (kbps), [7]: 80000 (kbps)
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 mpls te bandwidth change thresholds up 20 mpls te bandwidth change thresholds down 20 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 tunnel-id 1 mpls te bandwidth ct0 20000 # 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 mpls te bandwidth change thresholds up 20 mpls te bandwidth change thresholds down 20 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