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Why Bandwidth is not reserved for incoming interfaces?

Hi,

When i put show mpls traffic-eng topology command i see reservation only on outgoing interfaces of the router. Why? Why not the incoming interfaces?

      link[0]: Broadcast, DR: 3.3.3.53, nbr_node_id:12, gen:40

          frag_id 1, Intf Address:3.3.3.35

          TE metric:1, IGP metric:1, attribute flags:0x0

          SRLGs: None

          physical_bw: 100000 (kbps), max_reservable_bw_global: 75000 (kbps)

          max_reservable_bw_sub: 0 (kbps)

                                 Global Pool       Sub Pool

               Total Allocated   Reservable        Reservable

               BW (kbps)         BW (kbps)         BW (kbps)

               ---------------   -----------       ----------

        bw[0]:            0            75000                0

        bw[1]:            0            75000                0

        bw[2]:            0            75000                0

        bw[3]:            0            75000                0

        bw[4]:            0            75000                0

        bw[5]:            0            75000                0

        bw[6]:            0            75000                0

        bw[7]:            0            75000                0

      link[1]: Broadcast, DR: 2.2.2.32, nbr_node_id:3, gen:40

          frag_id 2, Intf Address:2.2.2.32

          TE metric:1, IGP metric:1, attribute flags:0x0

          SRLGs: None

          physical_bw: 100000 (kbps), max_reservable_bw_global: 75000 (kbps)

          max_reservable_bw_sub: 0 (kbps)

                                 Global Pool       Sub Pool

               Total Allocated   Reservable        Reservable

               BW (kbps)         BW (kbps)         BW (kbps)

               ---------------   -----------       ----------

        bw[0]:            0            75000                0

        bw[1]:            0            75000                0

        bw[2]:            0            75000                0

        bw[3]:            0            75000                0

        bw[4]:            0            75000                0

        bw[5]:            0            75000                0

        bw[6]:            0            75000                0

        bw[7]:        70000             5000                0

Link 1 reservation is there but on link 0 NO RESERVATION. Why? Since link 0 is incoming interface and Link 1 is outgoing interface.of the tunnel.

Everyone's tags (2)
1 REPLY

Why Bandwidth is not reserved for incoming interfaces?

Hi Ankur,

That is because MPLS TE Tunnels are unidirectional.

So they are setup only in one direction from source to destination.

Consequently the resources reserved for a particular tunnel are reserved in one direction only.

So you might want to setup a tunnel in the opposite direction as well.

adam

adam
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