1999•Unpublished venueRequires access
Signaling Maximum Transmission Unit (MTU) using BGP-LS
Shuping Peng, Yongqing Zhu, Robbins Mwehair, Zhibo Hu
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Abstract
BGP Link State (BGP-LS) describes a mechanism by which link-state and
TE information can be collected from networks and shared with external
components using the BGP routing protocol. The centralized controller
(PCE/SDN) completes the service path calculation based on the
information transmitted by the BGP-LS and delivers the result to the
Path Computation Client (PCC) through the PCEP or BGP protocol.
Segment Routing (SR) leverages the source routing paradigm, which can
be directly applied to the MPLS architecture with no change on the
forwarding plane and applied to the IPv6 architecture, with a new type
of routing header, called SRH. The SR uses the IGP protocol as the
control protocol. Compared to the MPLS tunneling technology, the SR
does not require additional signaling. Therefore, the SR does not
support the negotiation of the Path MTU. Since multiple labels or SRv6
SIDs are pushed in the packets, it is more likely that the packet size
exceeds the path mtu of SR tunnel. This document specifies the
extensions to BGP Link State (BGP-LS) to carry maximum transmission
unit (MTU) messages of link. The PCE/SDN calculates the Path MTU while
completing the service path calculation based on the information
transmitted by the BGP-LS.