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MPLS TE max bandwidth

Hello.

I have MPLS TE backbone core and all routers are connected with 100M links. But when I analyze OSPF base I get interesting result:

R6#sh ip ospf database opaque-area

            OSPF Router with ID (6.6.6.6) (Process ID 1)

                Type-10 Opaque Link Area Link States (Area 0)

  LS age: 1931

  Options: (No TOS-capability, DC)

  LS Type: Opaque Area Link

  Link State ID: 1.0.0.0

  Opaque Type: 1

  Opaque ID: 0

  Advertising Router: 1.1.1.1

  LS Seq Number: 80000003

  Checksum: 0x54D3

  Length: 28

  Fragment number : 0

    MPLS TE router ID : 1.1.1.1

    Number of Links : 0

  LS age: 988

  Options: (No TOS-capability, DC)

  LS Type: Opaque Area Link

  Link State ID: 1.0.0.0

  Opaque Type: 1

  Opaque ID: 0

  Advertising Router: 3.3.3.3

  LS Seq Number: 80000003

  Checksum: 0xD5C4

  Length: 132

  Fragment number : 0

    MPLS TE router ID : 3.3.3.3

    Link connected to Broadcast network

      Link ID : 192.168.5.1

      Interface Address : 192.168.5.2

      Admin Metric : 1

      Maximum bandwidth : 12500000

      Maximum reservable bandwidth : 9375000

      Number of Priority : 8

      Priority 0 : 9375000     Priority 1 : 9375000  

      Priority 2 : 9375000     Priority 3 : 9375000  

And such output is for all links. Default RSVP reservation line 75% is taken from 125M but not 100M. Please clarify why is it so. Thanks

Everyone's tags (5)
1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

MPLS TE max bandwidth

Hi Volodymyr,

This value is indeed expressed in bytes per second as per RFC3630 section 2.5.6:

2.5.6.  Maximum Bandwidth

   The Maximum Bandwidth sub-TLV specifies the maximum bandwidth that    can be used on this link, in this direction (from the system    originating the LSA to its neighbor), in IEEE floating point format.    This is the true link capacity.  The units are bytes per second.    The Maximum Bandwidth sub-TLV is TLV type 6, and is four octets in    length.

For more information, please refer to the full RFC.

http://tools.ietf.org/html/rfc3630

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
3 REPLIES

MPLS TE max bandwidth

Hmm.

I think it is because the output is expressed in Bytes per second.

Hall of Fame Super Silver

MPLS TE max bandwidth

Hello Volodymyr,

yes I agree

Hope to help

Giuseppe

Cisco Employee

MPLS TE max bandwidth

Hi Volodymyr,

This value is indeed expressed in bytes per second as per RFC3630 section 2.5.6:

2.5.6.  Maximum Bandwidth

   The Maximum Bandwidth sub-TLV specifies the maximum bandwidth that    can be used on this link, in this direction (from the system    originating the LSA to its neighbor), in IEEE floating point format.    This is the true link capacity.  The units are bytes per second.    The Maximum Bandwidth sub-TLV is TLV type 6, and is four octets in    length.

For more information, please refer to the full RFC.

http://tools.ietf.org/html/rfc3630

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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