Manual:Interface/Traffic Engineering

Applies to RouterOS: v3, v4

Summary

Properties

Sub-menu: /interface traffic-eng

Property	Description
affinity-exclude (integer; Default: )	Do not use interface if resource-class matches any of specified bits.
affinity-include-all (integer; Default: )	Use interface only if resource-class matches all of specified bits.
affinity-include-any (integer; Default: )	Use interface if resource-class matches any of specified bits.
auto-bandwidth-avg-interval (time; Default: 5m)	Interval in which actual amount of data is measured, from which average bandwidth is calculated.
auto-bandwidth-range (Disabled | Min[bps][-Max[bps]]; Default: 0bps)	Auto bandwidth adjustment range. Read more >>
auto-bandwidth-reserve (integer[%]; Default: 0%)	Specifies percentage of additional bandwidth to reserve. Read more >>
auto-bandwidth-update-interval (time; Default: 1h)	Interval during which tunnel keeps track of highest average rate.
bandwidth (integer[bps]; Default: 0bps)	How much bandwidth to reserve for TE tunnel. Value is in bits per second. Read more >>
bandwidth-limit (disabled | integer[%]; Default: disabled)	Defines actual bandwidth limitation of TE tunnel. Limit is configured in percent of specified tunnel bandwidth. Read more >>
comment (string; Default: )	Short description of the item
disable-running-check (yes | no; Default: no)	Specifies whether to detect if interface is running or not. If set to no interface will always have running flag.
disabled (yes | no; Default: yes)	Defines whether item is ignored or used.
from-address (auto | IP; Default: auto)	Ingress address of the tunnel. If set to auto least IP address is picked.
holding-priority (integer [0..7]; Default: )	Is used to decide whether this session can be preempted by another session. 0 sets the highest priority.
mtu (integer; Default: )
name (string; Default: )	Name of the interface
primary-path (string; Default: )	Primary label switching paths defined in /mpls traffic-eng tunnel-path menu.
primary-retry-interval (time; Default: 1m)	Interval after which tunnel will try to use primary path.
record-route (yes | no; Default: )	If enabled, the sender node will receive information about the actual route that the LSP tunnel traverses. Record Route is analogous to a path vector, and hence can be used for loop detection.
reoptimize-interval (time; Default: )	Interval after which tunnel will re-optimize current path. If current path is not the best path then after optimization best path will be used. Read more >>
secondary-path (string[,string]; Default: )	List of label switching paths used by TE tunnel if primary path fails. Paths are defined in /mpls traffic-eng tunnel-path menu.
setup-priority (integer[0..7]; Default: )	Parameter is used to decide whether this session can preempt another session. 0 sets the highest priority.
to-address (IP; Default: 0.0.0.0)	Remote end of TE tunnel.

Monitoring

To verify TE tunnel's status monitor command can be used.

[admin@R3] /interface traffic-eng> monitor 0
             tunnel-id: 12
    primary-path-state: on-hold
  secondary-path-state: established
        secondary-path: static
           active-path: static
          active-lspid: 3
          active-label: 66
        explicit-route: "S:192.168.55.10/32,L:192.168.55.13/32,L:192.168.55.17/32"
        recorded-route: "192.168.55.13[66],192.168.55.17[59],192.168.55.18[3]"
    reserved-bandwidth: 5.0Mbps

Reoptimization

Path can be re-optimized manually by entering following command /interface traffic-eng reoptimize [id]. It allows network administrators to reoptimize the LSPs that have been established based on changes in bandwidth, traffic, management policy, or other factors.

Lets say TE tunnel chose another path after link failure on best path. You can verify optimization by looking at explicit-route or recorded-route if record-route parameter is enabled.

[admin@R3] /interface traffic-eng> monitor 0
             tunnel-id: 12
    primary-path-state: established
          primary-path: dyn
  secondary-path-state: not-necessary
           active-path: dyn
          active-lspid: 1
          active-label: 67
        explicit-route: "S:192.168.55.10/32,S:192.168.55.13/32,S:192.168.55.14/32,
                        S:192.168.55.17/32,S:192.168.55.18/32"
        recorded-route: "192.168.55.13[67],192.168.55.17[60],192.168.55.18[3]"
    reserved-bandwidth: 5.0Mbps

Whenever the link comes back, TE tunnel will use the same path even it is not the best path (unless reoptimize-interval is configured). To fix it we can manually reoptimize tunnel path.

[admin@R3] /interface traffic-eng> reoptimize 0

[admin@R3] /interface traffic-eng> monitor 0  
             tunnel-id: 12
    primary-path-state: established
          primary-path: dyn
  secondary-path-state: not-necessary
           active-path: dyn
          active-lspid: 2
          active-label: 81
        explicit-route: "S:192.168.55.5/32,S:192.168.55.2/32,S:192.168.55.1/32"
        recorded-route: "192.168.55.2[81],192.168.55.1[3]"
    reserved-bandwidth: 5.0Mbps

Notice how explicit-route and recorded-route changed to shorter path.

See Also

• TE Tunnel Auto Bandwidth
• TE tunnels explained

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