Cisco ASR 9000 Series Routing Configuration Guide

The address-family l2vpn vpls-vpws does not support additional-path. Hence, the l2vpn service that uses
address-family l2vpn vpls-vpws does not guarantee PIC convergence time.
Note
The 3107 PIC implementation supports these Cisco IOS XR features:
•
PIC Edge for 3107
• Traffic Engineering Fast-reroute (TE FRR)—Traffic convergence for core link failure is guaranteed
within 50 milliseconds using verbatim tunnel.
•
L2VPN Service (VPWS)
•
L3VPN VPNv4 Service
•
6 PE Service
•
6 VPE Service
•
VPLS Service
BGP 3107 PIC Updates for Global Prefixes implementation uses a shared recursive Load Info (RLDI)
forwarding object in place of a Light-Weight recursive (LW-RLDI) object. The RLDI is shared between
multiple leaves, while the LW-RLDI is instantiated per leaf. Sharing helps in handling PIC updates since it
will be prefix independent.
BGP Prefix Independent Convergence for RIB and FIB
BGP PIC for RIB and FIB adds support for static recursive as PE-CE and faster backup activation by using
fast re-route trigger.
The BGP PIC for RIB and FIB feature supports:
•
FRR-like trigger for faster PE-CE link down detection, to further reduce the convergence time (Fast
PIC-edge activation).
•
PIC-edge for static recursive routes.
•
BFD single-hop trigger for PIC-Edge without any explicit /32 static route configuration.
•
Recursive PIC activation at third level and beyond, on failure trigger at the first (IGP) level.
•
BGP path recursion constraints in FIB to ensure that FIB is in sync with BGP with respect to BGP
next-hop resolution.
BGP Update Message Error Handling
The BGP UPDATE message error handling changes BGP behavior in handling error UPDATE messages to
avoid session reset. Based on the approach described in IETF IDR I-D:draft-ietf-idr-error-handling, the Cisco
IOS XR BGP UPDATE Message Error handling implementation classifies BGP update errors into various
categories based on factors such as, severity, likelihood of occurrence of UPDATE errors, or type of attributes.
Errors encountered in each category are handled according to the draft. Session reset will be avoided as much
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
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Implementing BGP
BGP Prefix Independent Convergence for RIB and FIB

Cisco ASR 9000 Series Specifications

General

Brand	Cisco
Model	ASR 9000 Series
Category	Network Router
Language	English