03_02_在Cisco IOS平台上配置帧模式MPLS

2019年7月27日 05:43 作者：金淼淋分类：MPLS  1.09K

Frame-Mode MPLS Implementation on Cisco IOS Platforms
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Configuring Frame-Mode MPLS on
Cisco IOS Platforms
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wwwveslab net Outline
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— Overview
— What Are MPLS Configuration Tasks?
— Configuringthe MPLS ID on a Router
ID
— Configuring MPLS on a Frame-Mode Interface
MPLS
— Configuring a Label-Switching MT U
— Configuring IP TTL Propagation
— Configuring Conditional Label Distribution
— Configuring Frame-Mode MPLS on Switched WAN Media
— Summary
wwwveslab net MPLS Configuration Tasks
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•Mandatory:
— Enable CEF switching )fiÆCEFtJJift
— Configure LDP on every label-enabled interface
•Optional:
— Configure the MPLS ID ÅdHMPLS ID
— Configure MT U size for labeled packets Phd".
— Configure IPTTL propagation
— Configure conditional label advertising
wwwveslab net Configuring MPLS on a Frame-Mode
Interface
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Router (config—if) #
mpls ip
• Enables label switching on a frame-mode interface
Starts LDP on the interface
Router (config—if) #
mpls label protocol [tdp Idp both]
• Starts selected label distribution protocol on the specified interface
wwwveslab net Configuring MPLS on a Frame-Mode
Interface: Example 2
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Cisco Router Running
only TOP
Provider Network
ip cef
interface serial I/O
mpl S ip
mpls label protocol tdp
interface serial 2/1
mpI s ip
mpls label protocol Ldp
interface fastethernet 0/0
mpIs ip
mpIs label protocol both
Routers of Other Vendors
Running only LDP
blamcn Configuring Label-Switching MT U:
Example
Jumbo frames have to be enabled
on the switch.
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Set port 1/3 jumbo enable
set port 1/4 jumbo enable
ip cef
inter face
mp1s ip
mpls ip
serial 0/0
1512
Cisco Catalyst 6500
cef
3550:systemjumbomtu
interface fastethernet 0/0
mpls ip
mpls 1512
MPLS MTU is increased to 1512 to support 1500-byte IP packets and MPLS
stacks up to 3 levels deep. Configuring IP TTL Propagation:
Extended Options
Router
no mpls ip propagate-ttl [forwarded I local]
Selectively disables IP TTL propagation for:
• Forwarded traffic (Traceroute does not work for transit
traffic labeled by this router.) (Traceroute
. Local traffic (Traceroute does not work from the router but
works for transit traffic labeled by this router.)
fig o )
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Configuration: Example
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— The customer is already running IP infrastructure.
— MPLS is needed only to support MPLS VPN
services:
• Labels should be generated onlyfor loopback interfaces
(BGP next hops) of all routers.
All loopback interfaces are in one contiguous address
block (192.168.254.0/24). +
(192.168.254.0/24)
wwwveslab net Conditional Label Distribution
Configuration Steps
•Step 1: Enable CEF and label switching.
ip cef
interface serial 0/0
mpls ip
interface serial 0/1
mpls ip
interface ethernet 1/0
mpls ip
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mpls Idp neighbor x.x.x.x labels accept acl_number
wwwveslab net Configuring Frame-Mode MPLS on
Switched WAN Media
Why:
— Run MPLS over ATM networks that do not
support MPLS.
How:
— Configure MPLS over ATM point-to-point
subinterfaces on the routers.
wwwveslab net
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