BGP Traffic Engineering Attribute

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BGP Traffic Engineering Attribute

• draft-fedyk-bgp-te-attribute-02.txt
• Hamid Ould-Brahim hbrahim_at_nortel.com
• Don Fedyk dwfedyk_at_nortel.com
• Yakov Rekhter yakov_at_juniper.net

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BGP TE Attributes

• Summarize TE attributes for BGP
• TE information in BGP
• Why ?
• Where ?
• What ?
• Other Infomation ?

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Why?

• Need to know if a L1VPN connection can be set up
  from a CE to another CE.
• TE Database only has partial view of PE-CE links
• PE-CE Resources are local
• Need to deliver a resource view of CE-PE links to
  L1vpn PEs (and optionally to CEs).
• This document defines a new BGP attribute,
  Traffic Engineering attribute that enables BGP to
  carry Traffic Engineering information.
• Enables BGP to Carry information about PE-CE Link
  resources

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Where? (1)
BGP
PE1
P
PE2
CE1
CE2
Within the Provider Network, Part of BGP AD PE1
learns about Targeted resources of PE2-CE2 (PE1
Knows TE in Provider network due to IGP)
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Where? (2)
BGP
BGP
BGP
PE1
P
PE2
CE1
CE2
To the CE Same as (1) but then another session
can carry the information to the CE/VPN
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What?

• TE Metric carried as BGP MULTI_EXIT_DISC
• Switching Cap
• (e.g. LSC)
• Encoding
• (e.g. Ethernet, SDH, etc)
• Max LSP Bandwidth at priority 07
• Capability-specific information
• Minimum LSP Bandwidth
• Interface MTU/Indication (TDM)

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Others for discussion

• SRLG
• Shared resource link group does not summarize
  well.
• Protection Type/ Capability
• 11, 1n, Shared etc
• Administrative Groups (Colors)

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Comments? Thank you