02_03_引入帧模式MPLS中的融合

2019年7月27日 05:35 作者：金淼淋分类：MPLS  576

Label Assignment and Distribution
YES LAB
Introducing Convergence in Frame-Mode MPLS
YES LAB Outline
YES LAB
— Overview
— What Is the MPLS Steady-State Operation?
ffZÆMPLS
— What Happens in a Link
— What Is the Routing Protocol Convergence After a
Link ?
— What Is the MPLS Convergence After a Link Failure?
— What Actions Occur in Link Recovery?
— Summary Steady-State Operation Descriptio
YES LAB
FIB on B
Routing Table Of B
Network Next HO
x
Network
Label
25
c
LIB on B
LSR Label
local
75
LFIB on B
Action Next Ho
47
Network
LSR
MPLS Domain
Label
47
Network X
Occurs after the LSRs have exchanged the labels, and the LIB, LFIB, and FIB
data structures are completely populated. LIB, Link Failure Actions
Routing Table Of B
Network Next HO
LIB on B
Network _ LSR
Label
local
75
LFIB on B
Label Action Next Hop
25
YES LAB
FIB on B
Network
LSR
Label
MPLS Domain
Network X
— Routing protocol neighbors and LDP nei hborsare lost after a
link failure.% 0
— Entries are removed from various data structures* Routing Protocol Convergen
Routing Table Of B
Network Next HO
x
Network
Label
25
YES LAB
FIB on B
Network
LSR
Label
MPLS Domain
Network X
LIB on B
LSR Label
local
75
LFIB on B
Action Next Hop
Routing protocols rebuild the IP routing table and the IP forwarding table. MPLS Convergence
YES LAB
FIB on B
Routing Table Of B
Network Next HO
x
Network
Label
25
Network
LSR
MPLS Domain
Label
75
Network X
LIB on B
LSR Label
local
75
LFIB on B
Action Next Ho
75
The LFIB and labeling information in the FIB are rebuilt immediately after
the routing protocol convergence, based on labels stored in the MPLS Convergence After a Link
Failure
— MPLS convergence in frame-mode MPLS does not affect
the overall convergence
— MPLS convergence occurs immediately after the routing
protocol convergence, based on labels already stored in
the
YES LAB Link Recovery Actions
YES LAB
FIB on B
Routing Table Of B
Network Next HO
x
Network
Label
25
Network
LSR
MPLS Domain
Label
75
Network X
LIB on B
LSR Label
local
75
LFIB on B
Action Next Ho
75
Routing protocol neighbors are discovered after link recovery. Link Recovery Actions:
IP Routing Convergence
Routing Table of B
Network Next HO
LIB on B
Network LSR
local
YES LAB
FIB on B
Network LSR
Label
MPLS Domain
Network X
Label
25
75
LFIB on B
Label Action Next HO
25
— IP routing protocols rebuild the IP routing table.
— The FIB and the LFIB are also rebuilt, but the label information
might be lacking.