目录

简介

本文档演示如何使用ISDN基本速率接口(BRI)线路使用拨号器监视功能备份租用线路、WAN或串行连接。有关Dialer Watch的功能和操作的详细信息,请参阅评估备份接口、浮动静态路由和DDR备份的Dialer Watch

开始使用前 

规则

有关文档规则的详细信息,请参阅 Cisco 技术提示规则

先决条件

配置DDR备份介入二不同步骤:

  1. 配置DDR以传统DDR或拨号配置文件。在实施备份配置前验证您的DDR连接正常工作。这允许您在配置备份之前验证所使用的拨号方法、点对点协议(PPP)协商和身份验证是否成功。

  2. 当主链路发生故障时,请配置路由器首次备份DDR连接。此配置使用拨号器监视功能来触发拨出。

有关配置备份所需步骤的详细信息,请参阅文档配置DDR备份并排除故障

使用的组件

本文档中的信息基于以下软件和硬件版本。

本文档中的信息都是基于特定实验室环境中的设备创建的。本文档中使用的所有设备最初均采用原始(默认)配置。如果您是在真实网络上操作,请确保您在使用任何命令前已经了解其潜在影响。

背景理论

本示例使用拨号程序配置文件作为备用BRI链路。您还可以使用传统按需拨号路由(DDR),该路由使用dialer map命令进行备份BRI连接。有关使用拨号器映射配置拨号器监视的详细信息,请参阅使用BRI和拨号器监视配置DDR备份

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:要查找有关本文档中使用的命令的其他信息,请使用命令查找工具

网络图

本文档使用下图所示的网络设置。

bri_isdn_11048.gif

配置

本文档使用如下所示的配置。

krimson (Cisco 2500 路由器)
krimson#show running-config
 Building configuration...

 Current configuration : 5055 bytes
 !
 version 12.2
 service timestamps debug datetime msec
 service timestamps log datetime msec
 no service password-encryption
 !
 hostname krimson
 !
 logging buffered 500000 debugging
 no logging console
 enable password <deleted>
 !
 username kevin password 0 <deleted>
 ip subnet-zero
 no ip domain-lookup
 !
 isdn switch-type basic-net3
 !
 interface Ethernet0
  ip address 10.200.16.30 255.255.255.0
  no ip route-cache
  no ip mroute-cache
  no cdp enable
          
 ! <<- Unused interface configuration omitted
 !
 interface Serial1
 
!--- Primary Link (Frame Relay)

  bandwidth 64
  no ip address
  encapsulation frame-relay
  no ip route-cache
  no ip mroute-cache
 !
 interface Serial1.1 point-to-point
 
!--- Point-to-point Frame Relay subinterface

  ip address 10.5.5.2 255.255.255.0
  no ip route-cache
  frame-relay interface-dlci 20 
 !
 interface BRI0
 
!--- Backup physical interface

   description Backup ISDN, Nr. 4420038
   no ip address
   encapsulation ppp
   no ip route-cache
   no ip mroute-cache
   load-interval 30
   no keepalive
   dialer pool-member 1
 
!--- BRI 0 is a member of dialer pool 1

   isdn switch-type basic-net3
   no fair-queue
   no cdp enable
   ppp authentication chap
 !
 interface Dialer0
 
!--- Logical interface for the backup

   ip address 10.9.9.1 255.255.255.0
 
!--- The dialer is in the same network as the remote dialer interface

   encapsulation ppp
   no ip route-cache
   no ip mroute-cache
   dialer pool 1
 
!--- Dialer pool 1. BRI 0 is a member of this pool

   dialer remote-name kevin
 
!--- Authenticated remote name of the peer. !--- Verify that this name exactly matches the authenticated name !--- of the remote dialer

   dialer string 6120
 
!--- Number for outbound call. For inbound calls this is not needed

   dialer watch-group 1
 
!--- Enable dialer watch on this backup interface. !--- Watch the route specified with dialer watch-list 1 

   dialer-group 1
 
!--- Apply interesting traffic defined in dialer-list 1 

   no cdp enable
   ppp authentication chap
 !
 !
 router ospf 10
   log-adjacency-changes
   network 10.5.5.0 0.0.0.255 area 0
   network 10.7.7.0 0.0.0.255 area 0
   network 10.9.9.0 0.0.0.255 area 0
 !
 no ip classless
 ip route 0.0.0.0 0.0.0.0 10.200.16.1
 
!--- Default route through ethernet 0

 no ip http server
 !
 access-list 101 deny ospf any any
 
!--- Mark OSPF as uninteresting. !--- This will prevent OSPF hellos from keeping the link up

 access-list 101 permit ip any any
 
!--- All other IP traffic is interesting


 dialer watch-list 1 ip 10.8.8.0 255.255.255.0
 
!--- This defines the route(s) to be watched. !--- This exact route(including subnet mask) must exist in the routing table. !--- Use the dialer watch-group 1 command to apply this list to the backup !--- interface (interface dialer 0)

 dialer-list 1 protocol ip list 101
 
!--- Interesting traffic is defined by access-list 101. !--- This is applied to BRI0 using dialer-group 1 

 !
 line con 0
   exec-timeout 0 0
   privilege level 15
 line aux 0
   transport input all
 line vty 0 4
   exec-timeout 0 0
   password <deleted>
   login
  !
 end

kevin(2500)
kevin#show running-config
 version 12.2
 service timestamps debug datetime msec
 service timestamps log datetime msec
 !
 hostname kevin
 !
 username krimson password 0 <password>
 !
 isdn switch-type basic-net3
 !
 !
 interface Loopback0
  ip address 10.8.8.1 255.255.255.0
 
!--- This is the network the remote side is watching

  ip ospf network point-to-point
 !
 interface Loopback1
  ip address 172.19.0.1 255.255.255.255
 !
 interface Ethernet0
  ip address 10.200.17.26 255.255.255.0
 !
 interface Serial0
  no ip address
  encapsulation frame-relay
 !
 interface Serial0.1 point-to-point
 
!--- Primary link (Frame Relay sub-interface)

  ip address 10.5.5.1 255.255.255.0
  frame-relay interface-dlci 20 
 !
 interface BRI0
 
!--- Physical interface

  no ip address
  encapsulation ppp
  dialer pool-member 1
 
!--- Member of dialer pool 1

  isdn switch-type basic-net3
  no cdp enable
  ppp authentication chap
 !
 interface Dialer0
 
!--- Logical interface for incoming call

 ip address 10.9.9.2 255.255.255.0
 
!--- The dialer is in the same network as the remote dialer interface

 encapsulation ppp
 dialer pool 1
 
!--- Dialer pool 1. BRI 0 is a member of this pool

 dialer remote-name krimson
 
!--- Authenticated remote name of the peer. !--- Verify that this name exactly matches the authenticated name !--- of the remote dialer.

 dialer-group 1
 
!--- Apply interesting traffic defined in dialer-list 1

 no cdp enable
 ppp authentication chap
 !
 router ospf 10
  log-adjacency-changes
  network 10.5.5.0 0.0.0.255 area 0
  network 10.8.8.0 0.0.0.255 area 0
 
!--- Advertise the network the remote router is watching

  network 10.9.9.0 0.0.0.255 area 0
 !
 ip classless
 ip route 0.0.0.0 0.0.0.0 10.200.17.1
 no ip http server
 !
 dialer-list 1 protocol ip permit
 
!--- Interesting traffic definition. All IP traffic is interesting. !--- This is applied to BRI0 using dialer-group 1. !--- Since the remote router activates and deactivates the backup, this router !--- does not need to restrict interesting traffic

 no cdp run
 !
 line con 0
  exec-timeout 0 0
 line aux 0
  modem InOut
 line vty 0 4
  exec-timeout 0 0
  password <password>
  login
 !
 end

注意:  maui-nas-05的配置不包含任何与备份相关的命令。对于maui-nas-05,备份链路只是另一个拨入客户端。这样,在许多设备建立到同一中心站点的备份链路的情况下,可以简化中心站点的配置。在备份场景中,最好只让一端启动拨号,而另一端只接受呼叫。

拨号监视(Dialer Watch)命令

以下是可用于拨号器监视的命令列表。上述配置中包含了其中一些命令,而其他命令则供参考。

验证

本部分所提供的信息可用于确认您的配置是否正常工作。

输出解释器工具支持某些 show 命令(只限于注册用户),通过它可以查看 show 命令输出的分析。

故障排除

本部分提供的信息可用于对配置进行故障排除。

此处使用的帧中继配置(使用点对点子接口并使用开放最短路径优先(OSPF)作为路由协议)特定于此设置。但是,下面给出的故障排除步骤更为一般,可用于不同的配置,如帧中继点对多点或采用高级数据链路控制(HDLC)和点对点协议(PPP)封装的主链路,而不管所使用的路由协议如何。

为验证备份功能,我们将作为帧中继交换机的 Cisco 4500 路由器上的一个接口置于关闭状态,以模拟帧中继网络中的问题。因此,这会导致PVC非活动状态通过帧中继网络传导到DTE路由器上,帧中继子接口中断事件。监视的路由因此消失,备用链路被激活。

有关Dialer Watch故障排除的信息,请参阅文档配置DDR备份并排除故障

故障排除命令

输出解释器工具支持某些 show 命令(只限于注册用户),通过它可以查看 show 命令输出的分析。

注意:在发出debug令之前,请参阅有关Debug命令的重要信息

故障排除输出示例

在以下输出中,帧中继接口处于打开状态。

krimson#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
       * - candidate default, U - per-user static route, o - ODR
       P - periodic downloaded static route

   Gateway of last resort is 10.200.16.1 to network 0.0.0.0

   10.0.0.0/24 is subnetted, 6 subnets
   C 10.5.5.0 is directly connected, Serial1.1
   O 10.8.8.0 [110/1563] via 10.5.5.1, 00:01:31, Serial1.1 
   
!--- Initial state through the primary Frame Relay interface, !--- before line failure occurred

   C 10.9.9.0 is directly connected, Dialer0
   C 10.7.7.0 is directly connected, Loopback0
   C 10.200.16.0 is directly connected, Ethernet0
   S* 0.0.0.0/0 [1/0] via 10.200.16.1

   krimson#
   *Apr 17 01:00:50.591: OSPF: Rcv hello from 172.19.0.1 area 0 
   from Serial1.1 10.5.5.1
   *Apr 17 01:00:50.595: OSPF: End of hello processing
   *Apr 17 01:00:51.127: %SYS-5-CONFIG_I: Configured from console by console
   *Apr 17 01:01:00.591: OSPF: Rcv hello from 172.19.0.1 area 0 from Serial1.1    
   10.5.5.1
   *Apr 17 01:01:00.595: OSPF: End of hello processing
   *Apr 17 01:01:05.243: %LINK-3-UPDOWN: Interface Serial1, changed state to down    
   
!--- Frame Relay failure simulated by shutting down the interface on !--- the Cisco 4500 router(acting as switch)

   *Apr 17 01:01:05.251: OSPF: Interface Serial1.1 going Down
   *Apr 17 01:01:05.255: %OSPF-5-ADJCHG: Process 10, Nbr 172.19.0.1 on Serial1.1    
   from FULL to DOWN, Neighbor Down: Interface down or detached
   *Apr 17 01:01:05.399: DDR: Dialer Watch: watch-group = 1
   *Apr 17 01:01:05.403: DDR: network 10.8.8.0/255.255.255.0 DOWN,
   
!--- Watched network is down

   *Apr 17 01:01:05.407: DDR: primary DOWN
   *Apr 17 01:01:05.407: DDR: Dialer Watch: Dial Reason: Primary of group 1 DOWN
   *Apr 17 01:01:05.411: DDR: Dialer Watch: watch-group = 1, 
   *Apr 17 01:01:05.411: BR0 DDR: rotor dialout [priority]
   *Apr 17 01:01:05.411: DDR: dialing secondary by dialer string 6120 on Di0
   
!--- router dials 6120 on interface Dialer 1

   *Apr 17 01:01:05.415: BR0 DDR: Attempting to dial 6120
   *Apr 17 01:01:05.523: ISDN BR0: TX -> SETUP pd = 8 callref = 0x43
   *Apr 17 01:01:05.531: Bearer Capability i = 0x8890
   *Apr 17 01:01:05.535: Channel ID i = 0x83
   *Apr 17 01:01:05.543: Called Party Number i = 0x80, '6120', Plan:Unknown, 
   Type:Unknown
   *Apr 17 01:01:05.599: ISDN BR0: RX <- CALL_PROC pd = 8 callref = 0xC3
   *Apr 17 01:01:05.603: Channel ID i = 0x89
   *Apr 17 01:01:05.855: ISDN BR0: RX <- CONNECT pd = 8 callref = 0xC3
   *Apr 17 01:01:05.875: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up
   *Apr 17 01:01:05.875: BR0:1 DDR: Dialer Watch: resetting call in progress
   *Apr 17 01:01:05.883: %DIALER-6-BIND: Interface BR0:1 bound to profile Di0
   *Apr 17 01:01:05.891: BR0:1 PPP: Treating connection as a callout
   *Apr 17 01:01:05.895: BR0:1 PPP: Phase is ESTABLISHING, Active Open 
   [0 sess, 0 load]
   *Apr 17 01:01:05.899: BR0:1 LCP: O CONFREQ [Closed] id 54 len 15
   *Apr 17 01:01:05.903: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Apr 17 01:01:05.903: BR0:1 LCP: MagicNumber 0xF24F182E (0x0506F24F182E)
   *Apr 17 01:01:05.911: ISDN BR0: TX -> CONNECT_ACK pd = 8 callref = 0x43
   *Apr 17 01:01:05.939: BR0:1 LCP: I CONFREQ [REQsent] id 88 len 15
   *Apr 17 01:01:05.943: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Apr 17 01:01:05.943: BR0:1 LCP: MagicNumber 0x9B15A6B0 (0x05069B15A6B0)
   *Apr 17 01:01:05.947: BR0:1 LCP: O CONFACK [REQsent] id 88 len 15
   *Apr 17 01:01:05.951: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Apr 17 01:01:05.955: BR0:1 LCP: MagicNumber 0x9B15A6B0 (0x05069B15A6B0)
   *Apr 17 01:01:05.959: BR0:1 LCP: I CONFACK [ACKsent] id 54 len 15
   *Apr 17 01:01:05.963: BR0:1 LCP: AuthProto CHAP (0x0305C22305)
   *Apr 17 01:01:05.963: BR0:1 LCP: MagicNumber 0xF24F182E (0x0506F24F182E)
   *Apr 17 01:01:05.967: BR0:1 LCP: State is Open
   *Apr 17 01:01:05.967: BR0:1 PPP: Phase is AUTHENTICATING, by both 
   [0 sess, 0 load]
   *Apr 17 01:01:05.971: BR0:1 CHAP: O CHALLENGE id 54 len 28 from "krimson"
   *Apr 17 01:01:06.051: BR0:1 CHAP: I CHALLENGE id 56 len 26 from "kevin"
   *Apr 17 01:01:06.055: BR0:1 CHAP: O RESPONSE id 56 len 28 from "krimson"
   *Apr 17 01:01:06.151: BR0:1 CHAP: I SUCCESS id 56 len 4
   *Apr 17 01:01:06.167: BR0:1 CHAP: I RESPONSE id 54 len 26 from "kevin"
   *Apr 17 01:01:06.175: BR0:1 CHAP: O SUCCESS id 54 len 4
   *Apr 17 01:01:06.179: BR0:1 PPP: Phase is UP [0 sess, 0 load]
   *Apr 17 01:01:06.183: BR0:1 IPCP: O CONFREQ [Not negotiated] id 46 len 10
   *Apr 17 01:01:06.187: BR0:1 IPCP: Address 10.9.9.1 (0x03060A090901)
   *Apr 17 01:01:06.279: BR0:1 IPCP: I CONFREQ [REQsent] id 34 len 10
   *Apr 17 01:01:06.283: BR0:1 IPCP: Address 10.9.9.2 (0x03060A090902)
   *Apr 17 01:01:06.287: BR0:1 IPCP: O CONFACK [REQsent] id 34 len 10
   *Apr 17 01:01:06.291: BR0:1 IPCP: Address 10.9.9.2 (0x03060A090902)
   *Apr 17 01:01:06.295: BR0:1 IPCP: I CONFACK [ACKsent] id 46 len 10
   *Apr 17 01:01:06.299: BR0:1 IPCP: Address 10.9.9.1 (0x03060A090901)
   *Apr 17 01:01:06.303: BR0:1 IPCP: State is Open
   *Apr 17 01:01:06.315: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1,    
   changed state to down
   *Apr 17 01:01:06.319: BR0:1 DDR: dialer protocol up
   *Apr 17 01:01:06.327: Di0 IPCP: Install route to 10.9.9.2
   *Apr 17 01:01:07.175: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1,    
   changed state to up
   
!--- Call connects

   *Apr 17 01:01:10.775: OSPF: Rcv hello from 172.19.0.1 area 0 from Dialer0 10.9.9.2
   
!--- OSPF hello from the peer

   *Apr 17 01:01:10.779: OSPF: End of hello processing
   *Apr 17 01:01:11.891: %ISDN-6-CONNECT: Interface BRI0:1 is now connected to 6120 
   
   kevin#show interface serial 1.1
   Serial1.1 is down, line protocol is down 
   
!--- Primary link is still down

   Hardware is HD64570
   Internet address is 10.5.5.2/24
   MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, 
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation FRAME-RELAY
   
   krimson#show interface dialer 0 
   
!--- Backup interface is up and active

   Dialer0 is up, line protocol is up (spoofing)
   Hardware is Unknown
   Internet address is 10.9.9.1/24
   MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec, 
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation PPP, loopback not set
   DTR is pulsed for 1 seconds on reset
   Interface is bound to BR0:1
   Last input 1w6d, output never, output hang never
   Last clearing of "show interface" counters 6w5d
   Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
   Queueing strategy: weighted fair
   Output queue: 0/1000/64/0 (size/max total/threshold/drops) 
   Conversations 0/1/16 (active/max active/max total)
   Reserved Conversations 0/0 (allocated/max allocated)
   Available Bandwidth 42 kilobits/sec
   5 minute input rate 0 bits/sec, 0 packets/sec
   5 minute output rate 0 bits/sec, 0 packets/sec
   882 packets input, 69656 bytes
   892 packets output, 70436 bytes
   Bound to:
   BRI0:1 is up, line protocol is up 
   Hardware is BRI
   MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, 
   
   reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation PPP, loopback not set
   Keepalive not set
   DTR is pulsed for 1 seconds on reset
   Time to interface disconnect: idle 00:01:38
   Interface is bound to Di0 (Encapsulation PPP)
   LCP Open
   Open: IPCP
   Last input 00:00:03, output 00:00:01, output hang never
   Last clearing of "show interface" counters never
   Queueing strategy: fifo
   Output queue 0/40, 0 drops; input queue 0/75, 0 drops
   30 second input rate 0 bits/sec, 0 packets/sec
   30 second output rate 0 bits/sec, 0 packets/sec
   4213 packets input, 414529 bytes, 0 no buffer
   Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
   29 input errors, 18 CRC, 0 frame, 0 overrun, 0 ignored, 11 abort
   3922 packets output, 242959 bytes, 0 underruns
   0 output errors, 0 collisions, 27 interface resets
   0 output buffer failures, 0 output buffers swapped out
   622 carrier transitions
   
   krimson#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
   D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
   N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
   E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
   i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
   * - candidate default, U - per-user static route, o - ODR
   P - periodic downloaded static route

   Gateway of last resort is 10.200.16.1 to network 0.0.0.0

   192.168.64.0/30 is subnetted, 1 subnets
   C 192.168.64.0 is directly connected, Dialer4
   10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
   C 10.9.9.2/32 is directly connected, Dialer0
   O 10.8.8.0/24 [110/1786] via 10.9.9.2, 00:00:25, Dialer0 
   
!--- New route to the same destination (through dialer 0). !--- Network now points to backup interface

   C 10.9.9.0/24 is directly connected, Dialer0
   C 10.7.7.0/24 is directly connected, Loopback0
   C 10.9.8.0/24 is directly connected, Dialer1
   C 10.200.16.0/24 is directly connected, Ethernet0
   S* 0.0.0.0/0 [1/0] via 10.200.16.1

在以下输出中,帧中继接口即将启动。

*Apr 17 01:02:50.631: %LINEPROTO-5-UPDOWN: Line protocol 
   on Interface Serial1,
    changed state to up 
   
!--- Primary is UP again

   *Apr 17 01:02:50.975: OSPF: Rcv hello from 172.19.0.1 area 0 
   from Dialer0 10.9.9.2
   *Apr 17 01:02:50.979: OSPF: End of hello processing

   *Apr 17 01:03:00.975: OSPF: Rcv hello from 172.19.0.1 area 0 
   from Dialer0 10.9.9.2
   *Apr 17 01:03:00.979: OSPF: End of hello processing
   *Apr 17 01:03:05.887: BR0:1 DDR: idle timeout
   *Apr 17 01:03:05.887: DDR: Dialer Watch: watch-group = 1
   *Apr 17 01:03:05.887: DDR: network 10.8.8.0/255.255.255.0 UP, 
   
!--- Watched route is UP

   *Apr 17 01:03:05.891: DDR: primary DOWN
   *Apr 17 01:03:10.551: OSPF: Rcv hello from 172.19.0.1 area 0 
   from Serial1.1
    10.5.5.1
   *Apr 17 01:03:10.555: OSPF: End of hello processing
   *Apr 17 01:03:10.975: OSPF: Rcv hello from 172.19.0.1 area 0 
   from Dialer0 10.9.9.2
   *Apr 17 01:03:10.979: OSPF: End of hello processing
   
   krimson#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
   D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
   N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
   E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
   i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
   * - candidate default, U - per-user static route, o - ODR
   P - periodic downloaded static route

   Gateway of last resort is 10.200.16.1 to network 0.0.0.0

   10.0.0.0/8 is variably subnetted, 7 subnets, 2 masks
   C 10.9.9.2/32 is directly connected, Dialer0
   C 10.5.5.0/24 is directly connected, Serial1.1
   O 10.8.8.0/24 [110/1563] via 10.5.5.1, 00:00:01, Serial1.1 
   
! -- Route entry to destination network via primary has been installed again.

   C 10.9.9.0/24 is directly connected, Dialer0
   C 10.7.7.0/24 is directly connected, Loopback0
   C 10.9.8.0/24 is directly connected, Dialer1
   C 10.200.16.0/24 is directly connected, Ethernet0
   S* 0.0.0.0/0 [1/0] via 10.200.16.1

   krimson#show isdn active
   --------------------------------------------------------------------------------
   ISDN ACTIVE CALLS
   --------------------------------------------------------------------------------
   Call  Calling Called Remote Seconds Seconds Seconds Charges
   Type  Number  Number Name   Used    Left    Idle    Units/Currency
   --------------------------------------------------------------------------------
   Out   6120           kevin  149     90      29      0 
   --------------------------------------------------------------------------------

秒空闲字段指出没有更多流量通过备份接口,空闲时间增加。

krimson# show isdn active
   --------------------------------------------------------------------------------
   ISDN ACTIVE CALLS
   --------------------------------------------------------------------------------
   Call Calling Called Remote Seconds Seconds Seconds Charges
   Type Number  Number Name   Used    Left    Idle    Units/Currency
   --------------------------------------------------------------------------------
   Out          6120   kevin  165      74      45      0 
   --------------------------------------------------------------------------------
   
   krimson# show isdn active
   --------------------------------------------------------------------------------
   ISDN ACTIVE CALLS
   --------------------------------------------------------------------------------
   Call Calling Called Remote Seconds Seconds Seconds  Charges
   Type Number  Number Name   Used    Left    Idle     Units/Currency
   --------------------------------------------------------------------------------
   Out          6120   kevin   224    15      104       0 
   --------------------------------------------------------------------------------

   krimson#show isdn active
   --------------------------------------------------------------------------------
   ISDN ACTIVE CALLS
   --------------------------------------------------------------------------------
   Call Calling Called Remote Seconds Seconds Seconds Charges
   Type Number Number Name Used Left Idle Units/Currency
   --------------------------------------------------------------------------------
   --------------------------------------------------------------------------------

   krimson#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
   D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
   N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
   E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
   i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
   * - candidate default, U - per-user static route, o - ODR
   P - periodic downloaded static route

   Gateway of last resort is 10.200.16.1 to network 0.0.0.0

   192.168.64.0/30 is subnetted, 1 subnets
   C 192.168.64.0 is directly connected, Dialer4
   10.0.0.0/24 is subnetted, 6 subnets
   C 10.5.5.0 is directly connected, Serial1.1
   O 10.8.8.0 [110/1563] via 10.5.5.1, 00:01:52, Serial1.1
   C 10.9.9.0 is directly connected, Dialer0
   C 10.7.7.0 is directly connected, Loopback0
   C 10.9.8.0 is directly connected, Dialer1
   C 10.200.16.0 is directly connected, Ethernet0
   S* 0.0.0.0/0 [1/0] via 10.200.16.1

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