2018•Unpublished venueRequires access
BGP-LS Extensions for Advertising Path MTU
Gang Yan, Yongqing Zhu, Junda Yao, 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 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 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 MTU exceeds the
limit in the SR tunneling technology. This document specify the
extension to BGP Link State (BGP-LS) to carry maximum transmission
unit (MTU) messages. The PCE/SDN calculates the Path MTU while
completing the service path calculation based on the information
transmitted by the BGP-LS.