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FAQ - How to Query and Calculate Reserved Bandwidth Used by and Available for TE Tunnels

Publication Date:  2013-09-24 Views:  42 Downloads:  0
Issue Description
If the total bandwidth of tunnels carried by a physical link is greater than the reserved bandwidth on the link, a router displays a message indicating that tunnel creation fails due to insufficient bandwidth. To ensure that tunnels can be successfully created, the remaining available reserved bandwidth on a physical link needs to be queried and calculated sometime. 
Handling Process
None
Root Cause
None
Solution

1. Run the disp mpls te link-administration bandwidth-allocation interface ID of the link to be queried command (for example, interface pos 4/0/0) to query the bandwidth used by tunnels with different priorities and the remaining available reserved bandwidth on the interface.

[R]disp mpls te link-administration bandwidth-allocation interface pos 4/0/0
  Link ID:  Pos4/0/0
  Physical Bandwidth Type0   :  1000000 kbits/sec
  Physical Bandwidth Type1   :  0 kbits/sec
  Reservable Bandwidth Type0 :  500000 kbits/sec
  Reservable Bandwidth Type1 :  0 kbits/sec
  Downstream LSP Count       :  1
  UpStream LSP Count         :  0
  Downstream Bandwidth       :  300000 kbits/sec
  Upstream Bandwidth         :  0 kbits/sec
  IPUpdown Link Status       :  UP
  PhysicalUpdown Link Status :  UP
  TE CLASS    CLASS TYPE    PRIORITY     BW RESERVED(kbps)  BW AVAILABLE(kbps)
  0           0             0            0                  500000
  1           0             1            0                  500000
  2           0             2            0                  500000
  3           0             3            0                  500000
  4           0             4            0                  500000
  5           0             5            0                  500000
  6           0             6            0                  500000
  7           0             7            300000             200000
  8           1             0            0                  0
  9           1             1            0                  0
  10          1             2            0                  0
  11          1             3            0                  0
  12          1             4            0                  0
  13          1             5            0                  0
  14          1             6            0                  0
  15          1             7            0                  0

According to the preceding output, 300000 kbit/s of the bc0 reserved bandwidth for tunnels with priority being 3 is used, and 200000 kbit/s is available; the bc0 reserved bandwidth for tunnels with other priorities is not used, and 500000 kbit/s is available; the bc0 reserved bandwidth is 0.

2. Run the display mpls te link-administration admission-control interface ID of the link to be queried command (for example, interface pos 4/0/0) to query reserved bandwidth used by LSPs.

<R>disp mpls te link-administration admission-control
LspID               In/Out IF                     S/H Prio  CT        BW(kbps)
1.1.1.2:42          --- / Pos4/0/0                7 /7      0         300000
1.1.1.2:44          --- / Pos4/0/0                7 /7      0         100000 

According to the preceding output, TE tunnels with priority being 7 uses 400000 kbit/s reserved bandwidth of interface pos 4/0/0, among which the LSP 1.1.1.2:42 uses 300000 kbit/s and the LSP 1.1.1.2:44 uses 100000 kbit/s.
Suggestions
None

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