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Enhancements to BMP implementation in FRRouting
Maxence YOUNSI, INSA Lyon - maxence.younsi@insa-lyon.fr
Pierre FRANCOIS, INSA Lyon - pierre.francois@insa-lyon.fr
Thomas GRAF, Swisscom - thomas.graf@swisscom.com
IETF117-GROW-BMP
25/07/2023
● Allows to monitor the BGP behaviour of a router
○ Received Paths (BMP Adj-RIB-In) -- RFC 7854
○ Best Path (BMP Loc-RIB) -- RFC 9069
○ Advertised Paths (BMP Adj-RIB-Out) -- RFC8671
○ Statistics
● FRRouting
○ Basic support of BMP
● Project
○ Support all RFC’s
○ Support of ongoing GROW WG items
○ Wireshark dissectors
2
Getting Visibility into BGP RIBs with BMP
BGP Monitoring Protocol (BMP)
● RFCs
● Adj-RIB-In
○ No Add-Path Support
● Loc-RIB
○ No Support
● Adj-RIB-Out
○ No Support
● Drafts
● BMPv4
○ No Support
● Path Marking
○ No Support
BMP in FRRouting
Initial status
3
● Added Add-Path support
● Add-Path RX ID in Adj-In NLRI
● VRF Identification
4
BMP Adj-RIB-In -- RFC 7854
● Now supported
● Supports BGP Multipath
● Supports VRF identification
5
Best Path (BMP Loc-RIB) -- RFC 9069
● ECMP Diff in Local-RIB
○ Comparison of two sets of paths
in the FRRouting DP code…
● Collection issue
○ Leave Path-ID same as Rx-ID in NLRI
Ambiguous without draft-francois-grow-bmp-loc-peer
vs.
Regenerate Path-ID
Losing link with Adj-RIB-In
Best Path (BMP Loc-RIB) -- RFC 9069
Challenges
6
● Now supported
○ Supports BGP Add-Path
○ Supports VRF identification
7
Advertised Paths (BMP Adj-RIB-Out) -- RFC8671
Advertised Paths (BMP Adj-RIB-Out) -- RFC8671
Implementation challenges
● FRRouting does not retain
RIB-out Pre-Policy paths
⇒
● Unchanged out pre-policy paths may
be “updated” after a DP run
● Some statistics are not possible
without relevant resource impact
8
BMP v4 TLV
draft-ietf-grow-bmp-tlv
● Added TLV for BGP PDUs in Route Monitoring Messages
● Added Group TLV code, not leveraged by a feature
● Added Capability TLV code, not leveraged by a feature
9
BMP Path Marking
Path status and Reason codes
● Added most status and all reason codes
● No e-bit needed for FRR at the moment
● Missing
○ Invalid ROV
○ Backup
○ Best-external
10
Wireshark
● BMP v4 TLV https://github.com/network-analytics/wireshark/tree/draft-ietf-grow-bmp-tlv
● BMP Path-Marking
https://github.com/network-analytics/wireshark/tree/draft-cppy-grow-bmp-path-marking-tlv
11
References
FRRouting Links
● BMP Local-RIB Pull Request https://github.com/FRRouting/frr/pull/11800
● BMP Adj-RIB-Out https://github.com/mxyns/frr/tree/bmp-riboutmon
● BMP Multi-Path https://github.com/mxyns/frr/tree/bmp-multipath
● BMP v4 TLV https://github.com/mxyns/frr/tree/bmp-draft-tlv
● BMP Path-Marking https://github.com/mxyns/frr/tree/bmp-draft-path-marking
● BMP Loc-RIB Peer https://github.com/mxyns/frr/tree/bmp-draft-francois-grow-bmp-loc-peer
● BMP Fix Per-Peer Header Ports https://github.com/FRRouting/frr/pull/13198
12
Thanks !
Maxence YOUNSI, INSA Lyon - maxence.younsi@insa-lyon.fr
Pierre FRANCOIS, INSA Lyon - pierre.francois@insa-lyon.fr
Thomas GRAF, Swisscom - thomas.graf@swisscom.com
IETF117-GROW-BMP
25/07/2023

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slides-117-grow-grow-bmp-enhancements-to-frrouting-00.pdf

  • 1. Enhancements to BMP implementation in FRRouting Maxence YOUNSI, INSA Lyon - maxence.younsi@insa-lyon.fr Pierre FRANCOIS, INSA Lyon - pierre.francois@insa-lyon.fr Thomas GRAF, Swisscom - thomas.graf@swisscom.com IETF117-GROW-BMP 25/07/2023
  • 2. ● Allows to monitor the BGP behaviour of a router ○ Received Paths (BMP Adj-RIB-In) -- RFC 7854 ○ Best Path (BMP Loc-RIB) -- RFC 9069 ○ Advertised Paths (BMP Adj-RIB-Out) -- RFC8671 ○ Statistics ● FRRouting ○ Basic support of BMP ● Project ○ Support all RFC’s ○ Support of ongoing GROW WG items ○ Wireshark dissectors 2 Getting Visibility into BGP RIBs with BMP BGP Monitoring Protocol (BMP)
  • 3. ● RFCs ● Adj-RIB-In ○ No Add-Path Support ● Loc-RIB ○ No Support ● Adj-RIB-Out ○ No Support ● Drafts ● BMPv4 ○ No Support ● Path Marking ○ No Support BMP in FRRouting Initial status 3
  • 4. ● Added Add-Path support ● Add-Path RX ID in Adj-In NLRI ● VRF Identification 4 BMP Adj-RIB-In -- RFC 7854
  • 5. ● Now supported ● Supports BGP Multipath ● Supports VRF identification 5 Best Path (BMP Loc-RIB) -- RFC 9069
  • 6. ● ECMP Diff in Local-RIB ○ Comparison of two sets of paths in the FRRouting DP code… ● Collection issue ○ Leave Path-ID same as Rx-ID in NLRI Ambiguous without draft-francois-grow-bmp-loc-peer vs. Regenerate Path-ID Losing link with Adj-RIB-In Best Path (BMP Loc-RIB) -- RFC 9069 Challenges 6
  • 7. ● Now supported ○ Supports BGP Add-Path ○ Supports VRF identification 7 Advertised Paths (BMP Adj-RIB-Out) -- RFC8671
  • 8. Advertised Paths (BMP Adj-RIB-Out) -- RFC8671 Implementation challenges ● FRRouting does not retain RIB-out Pre-Policy paths ⇒ ● Unchanged out pre-policy paths may be “updated” after a DP run ● Some statistics are not possible without relevant resource impact 8
  • 9. BMP v4 TLV draft-ietf-grow-bmp-tlv ● Added TLV for BGP PDUs in Route Monitoring Messages ● Added Group TLV code, not leveraged by a feature ● Added Capability TLV code, not leveraged by a feature 9
  • 10. BMP Path Marking Path status and Reason codes ● Added most status and all reason codes ● No e-bit needed for FRR at the moment ● Missing ○ Invalid ROV ○ Backup ○ Best-external 10
  • 11. Wireshark ● BMP v4 TLV https://github.com/network-analytics/wireshark/tree/draft-ietf-grow-bmp-tlv ● BMP Path-Marking https://github.com/network-analytics/wireshark/tree/draft-cppy-grow-bmp-path-marking-tlv 11
  • 12. References FRRouting Links ● BMP Local-RIB Pull Request https://github.com/FRRouting/frr/pull/11800 ● BMP Adj-RIB-Out https://github.com/mxyns/frr/tree/bmp-riboutmon ● BMP Multi-Path https://github.com/mxyns/frr/tree/bmp-multipath ● BMP v4 TLV https://github.com/mxyns/frr/tree/bmp-draft-tlv ● BMP Path-Marking https://github.com/mxyns/frr/tree/bmp-draft-path-marking ● BMP Loc-RIB Peer https://github.com/mxyns/frr/tree/bmp-draft-francois-grow-bmp-loc-peer ● BMP Fix Per-Peer Header Ports https://github.com/FRRouting/frr/pull/13198 12
  • 13. Thanks ! Maxence YOUNSI, INSA Lyon - maxence.younsi@insa-lyon.fr Pierre FRANCOIS, INSA Lyon - pierre.francois@insa-lyon.fr Thomas GRAF, Swisscom - thomas.graf@swisscom.com IETF117-GROW-BMP 25/07/2023