语音 : H.323

帧中继到 ATM 与LLQ 、PPP LFI 和cRTP 互工作的 VoIP QoS

2015 年 8 月 28 日 - 机器翻译
其他版本: PDFpdf | 英语 (2015 年 4 月 22 日) | 反馈


目录


简介

本文为VoIP提供了示例配置,使用了PATM的多链路PPP和帧中继互联(VoIP使用了MLPoATM/MLPoFR)。配置示例的中央焦点是服务质量(QoS)提供为了适当地支持在ATM/帧中继相互作用的广域网间的语音。配置示例也利用压缩实时协议(CRTP), ATM支持从Cisco IOS 软件版本12.2(2)T。

本文可以是读的独立配置指导、配置示例和验证命令的为了用于建立网络。提供部分背景信息,供与ATM/帧中继互联相关的特殊事件使用。参考这些文档关于基于帧中继的VoIP或PPP的QoS的更多信息:

先决条件

要求

尝试进行此配置之前,请确保满足以下要求:

您应该熟悉这些技术领域:

  • 访问控制列表

  • ATM永久虚电路(PVC)

  • 帧中继永久虚拟电路(数据链路连接标识符(DLCI))

  • 带宽管理

  • LLQ

  • LFI

  • 虚拟模板和虚拟访问接口

  • MLPPP

  • cRTP

使用的组件

本文档中的信息基于以下软件和硬件版本:

  • Cisco 3640作为ATM路由器

  • Cisco 2620作为帧中继路由器

  • Cisco IOS软件版本12.2(8)T (IP Plus)

注意: 作为一般使用指南,如果使用,最新的Cisco IOS 12.2主线维护版是使用的推荐的Cisco IOS软件版本MLPoATM/帧Cisco IOS软件版本12.2T要求在ATM路由器cRTP。

相关功能在这些Cisco IOS软件版本介绍:

  • LFI在Cisco IOS软件版本11.3介绍。

  • LLQ在Cisco IOS软件版本12.0(7)T介绍。

  • 基于帧中继的LLQ和ATM每个PVC在Cisco IOS软件版本12.1(2)T介绍。

  • 帧中继和ATM虚拟电路的多链路PPP LFI在Cisco IOS软件版本12.1(5)T介绍。

  • 在ATM的cRTP在Cisco IOS软件版本12.2(2)T介绍。

本文档中的信息都是基于特定实验室环境中的设备编写的。本文档中使用的所有设备最初均采用原始(默认)配置。如果您使用的是真实网络,请确保您已经了解所有命令的潜在影响。

规则

有关文档规则的详细信息,请参阅 Cisco 技术提示规则

背景信息

在提供最小化端到端延迟和抖动避免的重要问题为在间ATM/帧中继相互作用的网络的VoIP是:

这些文档提供背景信息有用的来源:

配置

本部分提供有关如何配置本文档所述功能的信息。

注意: 使用命令查找工具仅限注册用户)查找有关本文档所使用命令的详细信息。

网络图

本文档使用以下网络设置:

/image/gif/paws/22383/voip-qos-fr-atm-01.gif

配置

本文档使用以下配置:

注意: 请注意在此配置方面,两路由器在对ATM互联交换机的一帧中继连接背对背。然而在多数拓扑方面,语音可用的路由器能任何地方存在。通常,语音路由器使用LAN连通性到其他路由器,连接对ATM/帧广域网。在那些情况下,对广域网的路由器连接,帧中继和ATM必须为LLQ、LFI和MLPPP配置如这些配置所显示,因此他们能提供QoS而不是语音网关。

连接帧中继的路由器

!--- Note: This configuration is commented and numbered 
!--- in the order that commands should be entered.


version 12.2
service timestamps debug datetime msec
service timestamps log uptime
no service password-encryption
!
hostname FR
!
enable password cisco
!
username ATM password 0 cisco
voice-card 0
dspfarm
!
ip subnet-zero
!
!
!
!


!--- access-list 105 permit ip any any dscp ef specifies 
!--- that all traffic with Differentiated Services Code Point (DSCP)
!--- are set to 40 falls into this access-list.
!--- This class-map command defines a class of traffic called "voice".


access-list 105 permit ip any any dscp ef 
access-list 105 permit udp any any  range 16384 32767
access-list 105 permit ip any any precedence critical
!
class-map match-all voice 
match access-group 105
!

!         
!

!--- This policy-map command defines a policy for LLQ called "VoIP" and 
!--- maps the "voice" class to the "VOIP" policy.
!--- "priority" defines the amount of bandwidth reserved for the priority queue.
!--- "class-default" specifies that the default class is also mapped to this policy.  
!--- "fair-queue" specifies that all other traffic is served in the WFQ.


policy-map VOIP 
  class voice 
    priority 48 
  class class-default  
   fair-queue 


!--- Note: Although it is possible to queue various types of 
!--- real-time traffic to the priority queue, 
!--- Cisco recommends that you direct only voice traffic 
!--- to it. Real-time traffic such as video or voice
!--- could introduce variations in delay. Please note voice and 
!--- video should not be combined in the same PVC.
!--- (the priority queue is a First In First Out (FIFO) 
!--- queue). Voice traffic requires that delay be 
!--- nonvariable in order to avoid jitter.

!--- Note: The sum of the values for priority and 
!--- bandwidth statements needs to be less 
!--- than or equal to 75% of the link bandwidth. 
!--- Otherwise service-policy cannot be 
!--- assigned to the link. When configuring VoIP over a 
!--- 64 Kbps link to support two 
!--- voice calls, it is common to allocate more than 75% 
!--- (48 Kbps) of the link bandwidth to 
!--- the priority queue. In such cases, you can use the  
!--- max-reserved-bandwidth <#%> command in order to raise 
!--- available bandwidth to a value more than 75%.


!
!
!
fax interface-type fax-mail
mta receive maximum-recipients 0
!
interface Loopback0
 ip address 10.1.1.2 255.255.255.0
!
!
interface FastEthernet0/0
 ip address 172.17.111.16 255.255.255.224
 duplex auto
 speed auto
!
interface Serial0/0
 no ip address
 encapsulation frame-relay IETF
 no ip route-cache
 no ip mroute-cache
 frame-relay traffic-shaping
!

!--- Choose the frame relay interface to be 
!--- associated with the virtual interface. The
!--- virtual template could equally have been associated 
!--- with the physical interface. 
!--- The "class mlp" associates the virtual template interface 
!--- defined in "interface Virtual-Template1" with a Frame Relay DLCI.
!--- Associates a Frame Relay map class with a DLCI.


interface Serial0/0.1 point-to-point 
 no ip route-cache
 no ip mroute-cache
 frame-relay interface-dlci 16 ppp Virtual-Template1 
  class mlp 


!--- The interface command creates a virtual 
!--- template called Virtual-Template1. 
!--- A bandwidth of 64 Kbps is assigned to this 
!--- template interface. This bandwidth is used
!--- by Cisco IOS to calculate the data fragment size as noted regarding
!--- interleaving of PPP segments.

!--- "ip rtp header-compression"—cRTP is supported in an ATM/Frame Relay Interworking 
!--- environment. It requires Cisco IOS Software Release 12.2(2)T on the 
!--- ATM router.

!--- "service-policy output VOIP"—The VoIP policy created earlier is assigned 
!--- to this interface in the outbound direction.
 
!--- PPP multilink is enabled and the 
!--- maximum delay per segment is specified. This bandwidth is   
!--- used by Cisco IOS to calculate the data fragement size as noted.

!--- Interleaving of PPP segments is enabled, which allows 
!--- voice packets to be expedited. Voice  
!--- packets need only wait behind a single segment of 
!--- a previously queued data packet (for example, 10 ms 
!--- delay) rather than wait until the end of the 
!--- entire data packet. Cisco IOS calculates the  
!--- data fragment size using the following formula: 
!--- fragment size = delay x bandwidth/8

!
interface Virtual-Template1 
 bandwidth 64 
 ip unnumbered loopback0
 ip rtp header-compression 
 no ip route-cache
 load-interval 30
 max-reserved-bandwidth 99
 service-policy output VOIP 
 ppp multilink 
 ppp multilink fragment-delay 10 
 ppp multilink interleave 
!


!
ip classless
ip route 0.0.0.0 0.0.0.0 172.17.111.1
no ip http server
ip pim bidir-enable
!
!
!

!--- A map class called mlp is created.
!--- With "no frame-relay adaptive-shaping", adaptive
!--- shaping is disabled. You do not 
!--- want to exceed CIR and have voice packets
!--- possibly queued within the Frame Relay network. 
!--- Waiting for a BECN to resolve this 
!--- situation could result in poor voice quality.
!--- The frame-relay cir 64000 command forces the router to transmit 
!--- at the desired CIR rate rather than line
!--- rate for the port.
!--- "frame-relay bc 640" configures the Bc value to force the desired 
!--- Tc (shaping interval) value is 10 ms. 
!--- This formula should be used to determine 
!--- the Bc value to use: Tc = Bc/CIR. A 
!--- smaller Tc value reduces the interval a voice 
!--- packet has to wait to be sent.
!--- As in "frame-relay be 0", the Be value should be set to zero
!--- in order to avoid voice being sent as part of a burst
!--- that is not guaranteed by the Frame Relay network.


map-class frame-relay mlp

 no frame-relay adaptive-shaping
 frame-relay cir 64000  
 frame-relay bc 640 
 frame-relay be 0 


!
call rsvp-sync
!
voice-port 1/0/0
!
voice-port 1/0/1
!
!
mgcp profile default
!
dial-peer cor custom
!
!
!
dial-peer voice 123 voip
 destination-pattern 123
 session target ipv4:10.1.1.1
 ip qos dscp cs5 media
 ip qos dscp cs5 signaling
 no vad
!
dial-peer voice 456 pots
 destination-pattern 456
 port 1/0/0
!
!
line con 0
line aux 0
line vty 0 4
 exec-timeout 0 0
 password cisco
 login
!
!
end

ATM的路由器

!--- Note: This configuration is commented only 
!--- where additional consideration is required from the 
!--- above configuration of the Frame Relay router.


version 12.2
service timestamps debug datetime msec
service timestamps log uptime
no service password-encryption
!
hostname ATM
!
enable password cisco
!
username FR password 0 cisco
memory-size iomem 25
ip subnet-zero
!
!
!
access-list 105 permit ip any any dscp ef
access-list 105 permit udp any any  range 16384 32767
access-list 105 permit ip any any precedence critical
!
class-map match-all voice
 match access-group 105
!
!

!--- Note: Matching commands to the Frame Relay 
!--- router side of the network.


!
!
policy-map VOIP
  class voice
    priority 48
  class class-default
   fair-queue


!--- Note: Matching commands to the Frame Relay 
!--- router side of the network.


!
!
fax interface-type fax-mail
mta receive maximum-recipients 0
!
controller T1 2/0
 framing sf
 linecode ami
!
!
!
!
interface ATM0/0
 no ip address
 ip route-cache
 no atm ilmi-keepalive
!

!--- "interface ATM0/0.1 point-to-point" chooses the ATM subinterface.
!---  The physical interface could equally have been used.
!--- "pvc 10/100" creates an ATM PVC. 
!--- "cbr 64"—A VBR PVC has been defined on this example.
!--- This exapmle uses VBR non-realtime and the sustained 
!--- cell rate (SCR) should be equal to the peak
!--- cell rate (PCR)  in order to avoid bursting. 
!--- ATM cell tax and the possibility
!--- of ATM bandwidth expansion due to poor 
!--- fragment/cell alignment, means that it  
!--- cannot be assumed that the PCR/SCR on the ATM 
!--- side should equal the CIR of the Frame Relay side.
!--- Maintain the value of CIR on the Frame-Relay side to define 
!--- our SCR, in this case, 64 kbps. This value may in some networks
!--- require some fine-tuning as the CIR on the Frame side does not
!--- exactly match the SCR on the ATM but makes for a good-enough estimation
!--- for most purposes.
!--- Refer to Designing and Deploying
!--- Multilink PPP over Frame Relay and ATM
!--- for more information. 
!--- "encapsulation aal5snap" is required.
!--- "protocol ppp Virtual-Template1" associates the virtual 
!--- template with the ATM PVC.


interface ATM0/0.1 point-to-point
 ip route-cache
 pvc 10/100 
  cbr 64 
  encapsulation aal5snap 
  protocol ppp Virtual-Template1 


!
!
interface loopback0
 ip address 10.1.1.1 255.255.255.0
!
interface Ethernet3/0
 ip address 172.17.111.15 255.255.255.224
 half-duplex
!
interface Ethernet3/1
 no ip address
 shutdown
 half-duplex
!
interface Virtual-Template1
 bandwidth 64
 ip unnumbered loopback0
 ip rtp header-compression
 no ip route-cache
 load-interval 30
 max-reserved-bandwidth 99
 service-policy output VOIP
 ppp multilink
 ppp multilink fragment-delay 10
 ppp multilink interleave


!--- Note: The virtual template is created in 
!--- exactly the same way as for the
!--- Frame Relay router side of the network. 
!--- An additional consideration for
!--- the ATM router is that the fragment size 
!--- should be optimized to fit into
!--- an integral number of ATM cells. 
!--- Refer to Designing and Deploying
!--- Multilink PPP over Frame Relay and ATM 
!--- for more information on this issue.


!
ip classless
ip route 0.0.0.0 0.0.0.0 172.17.111.1
ip http server
ip pim bidir-enable
!
!
call rsvp-sync
!
voice-port 1/0/0
 description FXS
!
voice-port 1/0/1
!
voice-port 1/1/0
 description FXO
!
voice-port 1/1/1
!
!
mgcp profile default
!
dial-peer cor custom
!
!
!
dial-peer voice 456 voip
 destination-pattern 456
 session target ipv4:10.1.1.2
 ip qos dscp cs5 media
 ip qos dscp cs5 signaling
 no vad   
!
dial-peer voice 123 pots
 destination-pattern 123
 port 1/1/0
!
!
line con 0
line aux 0
line vty 0 4
 exec-timeout 0 0
 password cisco
 login
!
!
end

验证

使用本部分可确认配置能否正常运行。

命令输出解释程序仅限注册用户)(OIT) 支持某些 show 命令。使用 OIT 可查看对 show 命令输出的分析。

这些显示命令是有用的在ATM/帧中继相互作用环境的运行状态的验证,包括DLCI和PVC统计信息、物理和虚拟接口状态、策略(QoS)应用程序和cRTP信息:

  • show ppp multilink interface interface-name命令---验证捆绑是否处于up/down状态,哪个虚拟访问接口处于捆绑状态(MLPPP捆绑),而哪些虚拟访问接口则是成员(PPP链路)。此命令也验证,如果载波丢弃信元/帧(丢失的片段<> 0)。唯一的可接受片段损失是循环冗余冗余校验(CRC)错误造成的一个。

  • show users —显示编号关联与虚拟访问接口。您可以使用此命令或show ppp multilink命令输出中的信息,这样您便可以显示接口的统计数据或者清除接口。

  • show frame-relay PVC dlci —显示信息例如流量整形参数、分段值和丢弃的数据包。如果物理接口一定对虚拟接口,此命令也显示。

  • show atm pvc pvc —显示所有活动ATM PVC和数据流信息。

  • show policy-map interface interface-name —显示所有LLQ操作和所有丢包在PQ。参考了解信息包计数器在show policy-map interface命令输出中关于此的多种字段的更多信息请发出命令。

    注意: 理想的排队机制总是应用对virtual-access2接口。其他接口使用FIFO队列。

  • show ip rtp header-compression —若被设定显示RTP报头压缩统计信息。注意统计信息附加对virtual-access2接口,是捆绑接口。

这些命令示例显示此处:

FR#show ppp multilink interface virtual-access 2
Virtual-Access2, bundle name is ATM
Bundle up for 00:22:42
0 lost fragments, 0 reordered, 0 unassigned
0 discarded, 0 lost received, 231/255 load
0x2E5 received sequence, 0x10C31 sent sequence
Member links: 1 (max not set, min not set)
Virtual-Access1, since 00:22:42, last rcvd seq 0002E4 160 weight

此输出显示帧中继路由器的show users

FR#show users
Line User Host(s) Idle Location
67 vty 1 idle 00:00:00 10.1.1.1
Interface User Mode Idle Peer Address
Vi1 Virtual PPP (FR ) - 
Vi2 Virtual PPP (Bundle) 00:00:00 10.1.1.1
FR#

此输出显示ATM路由器的show users

ATM#show users 
Line User Host(s) Idle Location
131 vty 1 idle 00:00:00 64.104.207.95
Interface User Mode Idle Peer Address
Vi1 Virtual PPP (ATM ) - 
Vi2 Virtual PPP (Bundle) 00:00:02 10.1.1.2
ATM#

此输出显示show frame-relay pvc命令

FR#show frame-relay pvc 16
 PVC Statistics for interface Serial0/0 (Frame Relay DTE)
 DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0.1
  
     input pkts 2301 output pkts 2295 in bytes 152266 
     out bytes 151891 dropped pkts 0 in FECN pkts 0 
     in BECN pkts 0 out FECN pkts 0 out BECN pkts 0 
     in DE pkts 0 out DE pkts 0 
     out bcast pkts 0 out bcast bytes 0 
     5 minute input rate 9000 bits/sec, 9 packets/sec
     5 minute output rate 9000 bits/sec, 9 packets/sec
     pvc create time 23:46:56, last time pvc status changed 00:22:56
     Bound to Virtual-Access1 (up, cloned from Virtual-Template1) 
     
!--- PPP link interface.

     cir 64000 bc 640 be 0 byte limit 80 interval 10 
     mincir 64000 byte increment 80 Adaptive Shaping none
     pkts 2296 bytes 152053 pkts delayed 9 bytes delayed 375
     shaping active 
     traffic shaping drops 0
     Queueing strategy: fifo
     Output queue 0/40, 0 drop, 0 dequeued
FR#

此输出显示show atm pvc 10/100命令在ATM路由器。

ATM#show atm pvc 10/100 
     ATM0/0.1: VCD: 1, VPI: 10, VCI: 100
     CBR, SusRate: 128
     AAL5-LLC/SNAP, etype:0x0, Flags: 0x820, VCmode: 0x0
     OAM frequency: 0 second(s), OAM retry frequency: 1 second(s)
     OAM up retry count: 3, OAM down retry count: 5
     OAM Loopback status: OAM Disabled
     OAM VC state: Not Managed
     ILMI VC state: Not Managed
     InARP frequency: 15 minutes(s)
     Transmit priority 1
     InPkts: 729, OutPkts: 729, InBytes: 49700, OutBytes: 51158
     InPRoc: 0, OutPRoc: 729
     InFast: 729, OutFast: 0, InAS: 0, OutAS: 0
     InPktDrops: 0, OutPktDrops: 0/0/0 (holdq/outputq/total)
     CrcErrors: 0, SarTimeOuts: 0, OverSizedSDUs: 0, LengthViolation: 0, 
     CPIErrors: 0
     OAM cells received: 0
     F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI: 0
     F4 InEndloop: 0, F4 InSegloop: 0, F4 InAIS: 0, F4 InRDI: 0
     OAM cells sent: 0
     F5 OutEndloop: 0, F5 OutSegloop: 0, F5 OutRDI: 0
     F4 OutEndloop: 0, F4 OutSegloop: 0, F4 OutRDI: 0
     OAM cell drops: 0
     Status: UP
   PPP: Virtual-Access2 from Virtual-Template1 
    
!--- MLPPP bundle interface.

ATM#

这是在帧中继路由器的show policy-map

FR#show policy-map interface Virtual-Access2
Service-policy output: VoIP
Class-map: voice (match-all)
15483 packets, 959502 bytes
30 second offered rate 24000 bps, drop rate 0 bps
Match: ip dscp 40 
Weighted Fair Queueing 
Strict Priority 

!--- LLQ Strict Priority Queue for voice.

Output Queue: Conversation 24 
Bandwidth 48(kbps) Burst 1500 (Bytes)
(pkts matched/bytes matched) 15536/962784
(total drops/bytes drops) 0/0 

!--- No drops in the voice queue.

Class-map: class-default (match-any)
139 packets, 19481 bytes
30 second offered rate 1000 bps, drop rate 0 bps
Match: any 
Weighted Fair Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 16 
(total queued/total drops/no-buffer drops) 0/0/0

此输出显示show policy map命令在ATM路由器。

ATM#show policy-map interface Virtual-Access2 
Service-policy output: VOIP
Class-map: voice (match-all)
11293 packets, 699718 bytes
30 second offered rate 24000 bps, drop rate 0 bps
Match: ip dscp 40 
Weighted Fair Queueing
Strict Priority 

!--- LLQ Strict Priority Queue for voice.

Output Queue: Conversation 24 
Bandwidth 48 (kbps) Burst 1500 (Bytes)
(pkts matched/bytes matched) 11352/703376
(total drops/bytes drops) 0/0 

!--- No drops in the voice queue.

Class-map: class-default (match-any)
63 packets, 9772 bytes
30 second offered rate 0 bps, drop rate 0 bps
Match: any 
Weighted Fair Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 16 
(total queued/total drops/no-buffer drops) 0/0/0
ATM#

此输出显示show ip rtp header-compression命令在帧中继路由器。

FR#show ip rtp header-compression
RTP/UDP/IP header compression statistics:
Interface Virtual-Access1:
Rcvd: 0 total, 0 compressed, 0 errors
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 0 total, 0 compressed,
0 bytes saved, 0 bytes sent
Connect: 16 rx slots, 16 tx slots,
0 long searches, 0 misses 0 collisions

Interface Virtual-Template1:
Rcvd: 0 total, 0 compressed, 0 errors
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 0 total, 0 compressed,
0 bytes saved, 0 bytes sent
Connect: 16 rx slots, 16 tx slots,
0 long searches, 0 misses 0 collisions

Interface Virtual-Access2:
Rcvd: 23682 total, 23681 compressed, 0 errors
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 327 total, 233 compressed,
8821 bytes saved, 5159 bytes sent
2.70 efficiency improvement factor
Connect: 16 rx slots, 16 tx slots,
0 long searches, 94 misses 0 collisions
71% hit ratio, five minute miss rate 0 misses/sec, 0 max

此输出显示show ip rtp header-compression命令在ATM路由器。

ATM#show ip rtp header-compression
RTP/UDP/IP header compression statistics:
Interface Virtual-Access1:
Rcvd: 0 total, 0 compressed, 0 errors
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 0 total, 0 compressed,
0 bytes saved, 0 bytes sent
Connect: 16 rx slots, 16 tx slots,
0 long searches, 0 misses 0 collisions, 0 negative cache hits

Interface Virtual-Template1:
Rcvd: 0 total, 0 compressed, 0 errors
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 0 total, 0 compressed,
0 bytes saved, 0 bytes sent
Connect: 16 rx slots, 16 tx slots,
0 long searches, 0 misses 0 collisions, 0 negative cache hits

Interface Virtual-Access2:
Rcvd: 283 total, 233 compressed, 0 errors
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 25341 total, 25340 compressed,
955537 bytes saved, 564463 bytes sent
2.69 efficiency improvement factor
Connect: 16 rx slots, 16 tx slots,
0 long searches, 1 misses 0 collisions, 100 negative cache hits
99% hit ratio, five minute miss rate 0 misses/sec, 0 max

故障排除

使用本部分可排除配置的故障。

此部分提供部分澄清MLP LFI的示例调试,它同时充当您排除配置故障的操作示例。

故障排除命令

命令输出解释程序仅限注册用户)(OIT) 支持某些 show 命令。使用 OIT 可查看对 show 命令输出的分析。

注意: 使用 debug 命令之前,请参阅有关 Debug 命令的重要信息

  • debug ppp negotiation——说明克隆二个虚拟访问接口,以代表PPP和PPP捆绑链路的过程。虚拟访问接口1 (Vi1)是的PPP链路,其中绑定了PVC (ATM或帧)。虚拟接口2 (Vi2)是排队策略附加的PPP捆绑链路。

  • debug ppp multilink fragment —说明用更加小的语音数据包被插入的更加大的数据包的概念。交叉发生在Vi2接口(MLP级别),因为捆绑接口被分配了的理想的排队。

这是debug ppp negotiation命令的命令输出。

FR(config-if)#no shut
FR(config-if)#^Z
FR#
FR#
6d23h: %LINK-3-UPDOWN: Interface Virtual-Access1, changed state to up
*Mar 7 23:20:42.842: Vi1 PPP: Treating connection as 
a dedicated line 

!--- Vi1 is the PPP link to which the PVC is bound.

*Mar 7 23:20:42.842: Vi1 PPP: Phase is ESTABLISHING, Active Open
*Mar 7 23:20:42.842: Vi1 LCP: O CONFREQ [Closed] id 197 len 19
*Mar 7 23:20:42.842: Vi1 LCP: MagicNumber 0xF44128D2 (0x0506F44128D2)
*Mar 7 23:20:42.842: Vi1 LCP: MRRU 1524 (0x110405F4)
*Mar 7 23:20:42.842: Vi1 LCP: EndpointDisc 1 FR (0x1305014652) 

!--- Router FR at one end of PPP discovery.

*Mar 7 23:20:42.858: Vi1 LCP: I CONFREQ [REQsent] id 14 len 20
*Mar 7 23:20:42.858: Vi1 LCP: MagicNumber 0x294819D4 (0x0506294819D4)
*Mar 7 23:20:42.858: Vi1 LCP: MRRU 1524 (0x110405F4)
*Mar 7 23:20:42.858: Vi1 LCP: EndpointDisc 1 ATM (0x13060141544D) 

!--- Router ATM at the other end of PPP discovery.

*Mar 7 23:20:42.858: Vi1 LCP: O CONFACK [REQsent] id 14 len 20

*Mar 7 23:20:42.862: Vi1 LCP: MagicNumber 0x294819D4 (0x0506294819D4)
*Mar 7 23:20:42.862: Vi1 LCP: MRRU 1524 (0x110405F4)
*Mar 7 23:20:42.862: Vi1 LCP: EndpointDisc 1 ATM (0x13060141544D)
*Mar 7 23:20:42.870: Vi1 LCP: I CONFACK [ACKsent] id 197 len 19
*Mar 7 23:20:42.870: Vi1 LCP: MagicNumber 0xF44128D2 (0x0506F44128D2)
*Mar 7 23:20:42.870: Vi1 LCP: MRRU 1524 (0x110405F4)
*Mar 7 23:20:42.870: Vi1 LCP: EndpointDisc 1 FR (0x1305014652)
*Mar 7 23:20:42.870: Vi1 LCP: State is Open
*Mar 7 23:20:42.870: Vi1 PPP: Phase is FORWARDING, Attempting Forward
*Mar 7 23:20:42.874: Vi1 PPP: Phase is ESTABLISHING, Finish LCP
*Mar 7 23:20:42.874: Vi1 PPP: Phase is VIRTUALIZED
*Mar 7 23:20:42.942: Vi2 PPP: Phase is DOWN, Setup
*Mar 7 23:20:43.222: Vi1 IPCP: Packet buffered while building MLP bundle interface
6d23h: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up 

!--- MLP level queuing.

*Mar 7 23:20:43.226: Vi2 PPP: Treating connection as a dedicated line
*Mar 7 23:20:43.226: Vi2 PPP: Phase is ESTABLISHING, Active Open
*Mar 7 23:20:43.226: Vi2 LCP: O CONFREQ [Closed] id 1 len 19
*Mar 7 23:20:43.226: Vi2 LCP: MagicNumber 0xF4412A53 (0x0506F4412A53)
*Mar 7 23:20:43.226: Vi2 LCP: MRRU 1524 (0x110405F4)
*Mar 7 23:20:43.230: Vi2 LCP: EndpointDisc 1 FR (0x1305014652)
*Mar 7 23:20:43.230: Vi2 MLP: 
Added first link Vi1 to bundle ATM 

!--- PVCs make up the bundle.

*Mar 7 23:20:43.230: Vi2 PPP: Phase is UP
*Mar 7 23:20:43.230: Vi2 IPCP: O CONFREQ [Closed] id 1 len 10
*Mar 7 23:20:43.234: Vi2 IPCP: Address 10.1.1.2 (0x03060A010102)
*Mar 7 23:20:43.234: Vi2 PPP: Pending ncpQ size is 1
*Mar 7 23:20:43.234: Vi1 IPCP: Redirect packet to Vi1
*Mar 7 23:20:43.234: Vi2 IPCP: I CONFREQ [REQsent] id 1 len 10
*Mar 7 23:20:43.234: Vi2 IPCP: Address 10.1.1.1 (0x03060A010101)
*Mar 7 23:20:43.234: Vi2 IPCP: O CONFACK [REQsent] id 1 len 10
*Mar 7 23:20:43.234: Vi2 IPCP: Address 10.1.1.1 (0x03060A010101)
*Mar 7 23:20:43.266: Vi2 IPCP: I CONFACK [ACKsent] id 1 len 10
*Mar 7 23:20:43.266: Vi2 IPCP: Address 10.1.1.2 (0x03060A010102)
*Mar 7 23:20:43.266: Vi2 IPCP: State is Open
*Mar 7 23:20:43.266: Vi2 IPCP: Install route to 10.1.1.1
*Mar 7 23:20:43.270: Vi2 IPCP: Add link info for cef entry 10.1.1.1

此命令输出是从debug ppp multilink fragment命令

*Mar 7 23:16:08.034: Vi2 MLP: 
Packet interleaved from queue 24
*Mar 7 23:16:08.038: Vi1 MLP: O ppp UNKNOWN(0x0000) (0000) size 64 
*Mar 7 23:16:08.038: Vi2 MLP: Packet interleaved from queue 24
*Mar 7 23:16:08.038: Vi1 MLP: O ppp UNKNOWN(0x0000) (0000) size 64 
*Mar 7 23:16:08.038: Vi2 MLP: Packet interleaved from queue 24
*Mar 7 23:16:08.038: Vi1 MLP: O ppp UNKNOWN(0x0000) (0000) size 64 
*Mar 7 23:16:08.038: Vi1 MLP: O frag 0000829B size 160 
*Mar 7 23:16:08.042: Vi1 MLP: I ppp IP (0021) size 64 direct
*Mar 7 23:16:08.046: Vi1 MLP: I ppp IP (0021) size 64 direct

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