CCNP BSCI实验手册：全面实战学习与考试准备指南

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"CCNP BSCI实验手册是一份专属于Cisco Systems, Inc.的独家文档，旨在帮助学习者深入理解和掌握BSCI（Broadband Switching and Internetworking）课程中的所有相关实验。该手册特别适用于参加CCNP 1：高级路由课程的学员，作为Cisco Networking Academy官方项目的一部分。在实验1-217的Lab 1.4.1中，读者将有机会熟悉新的CCNP实验室设备，并了解如何运用简单的文本编辑器来配置路由器。本实验的目标是引导学员熟悉基本的实验室操作环境，包括使用特定的路由器（如2600系列，尽管1700系列也可以兼容），以及运行Windows 2000操作系统的工作站。在这个初级活动中，学生将学习如何创建路由器配置并将其应用到实际设备上，这对于日常的工作和考试准备具有重要的实际操作价值。实验所需硬件包括一台单路由器，建议使用2600系列，但也可选择1700系列，配备一个带有标签的3.5英寸软盘驱动器。Ciscorouters的接口配置多种多样，有的型号可能只有固定接口，用户无法更改或替换，而其他型号则提供一两个或更多的模块化接口，这为灵活性提供了支持。在进行实验前，学员需了解路由器的模块化接口概念，因为这影响到配置过程和网络架构的选择。通过这个实践环节，学生不仅能提升对路由器操作系统的理解，还能增强对网络配置和管理技能的掌握，这些都是CCNP认证考试中不可或缺的部分。因此，CCNP BSCI实验手册不仅是一个教学工具，也是一个提升实际操作能力和理论联系实际的宝贵资源。"

15 - 217 CCNP 1: Advanced Routing v 3.0 - Lab 1.4.4 Copyright  2003, Cisco Systems, Inc.

Singapore(config)#ip route 0.0.0.0 0.0.0.0 200.200.100.2

ISP1(config)#ip route 192.168.1.0 255.255.255.0 200.200.100.1

Now, check that the WebServer is accessible by connecting from an Internal User workstation with a

browser using the WebServer IP address of 200.200.50.2.

Step 3

Determine which queuing mode is enabled on the Singapore router using the show interface

serial 0/0. A sample output is shown below.

ISP1#show interface s0/0

Serial0/0 is up, line protocol is up

Hardware is PowerQUICC Serial

Internet address is 200.200.100.2/24

MTU 1500 bytes, BW 128 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:00:05, output 00:00:02, output hang never

Last clearing of "show interface" counters never

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 0/1/32 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 96 kilobits/sec

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

13041 packets input, 877578 bytes, 0 no buffer

Received 11437 broadcasts, 0 runts, 0 giants, 0 throttles

3 input errors, 0 CRC, 3 frame, 0 overrun, 0 ignored, 0 abort

12200 packets output, 808601 bytes, 0 underruns

0 output errors, 0 collisions, 10 interface resets

0 output buffer failures, 0 output buffers swapped out

9 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

Weighted Fair Queuing (WFQ) is the default queuing mode on interfaces that run at or below E1

speeds (2.048 Mbps or less) and First In, First Out (FIFO) is the default if the bandwidth is greater

than E1 speeds.

1. What is the queuing mode on the Serial 0/0 interface of the Singapore router?

_______________________________________________________________________________

If the bandwidth of your serial interface is 128 K bit and the queuing mode is FIFO (contrary to the

statement above) as shown below, it is probably because no fair-queue was automatically

configured on the interface with the IOS version that is being used. You can use the show

running-config command to check if fair queuing was disabled by default. (See the partial

sample output below.)

ISP1#show interface s0/0

Serial0/0 is up, line protocol is up

Hardware is PowerQUICC Serial

Internet address is 200.200.100.2/24

MTU 1500 bytes, BW 128 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation HDLC, loopback not set

16 - 217 CCNP 1: Advanced Routing v 3.0 - Lab 1.4.4 Copyright  2003, Cisco Systems, Inc.

Keepalive set (10 sec)

Last input 00:00:06, output 00:00:09, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

---output omitted---

ISP1#show running-config

---output omitted---

interface Serial0/0

ip address 200.200.100.2 255.255.255.0

no fair-queue

clockrate 128000

---output omitted---.

Step 4

Priority queuing allows traffic types to be associated with one of four priorities: high, medium, normal,

and low. Priority queuing will transmit all packets in the high queue first. When the high queue is

empty, then packets in the medium queue will be transmitted. When the medium queue is empty, the

high queue is again checked for buffered packets. Because the higher priority queue is always

checked before lower priority queued packets are sent, it is possible that lower priority packets will

never get transmitted causing their sessions to time out.

You will configure priority queuing based on protocol type by designating http traffic as high priority

with all other IP traffic as medium priority on both the ISP1 and Singapore routers. The first step is to

define a priority list.

Singapore(config)#access-list 101 permit tcp any any eq 80

Singapore(config)#priority-list 1 protocol ip high list 101

Singapore(config)#access-list 102 permit ip any any

Singapore(config)#priority-list 1 protocol ip medium list 102

ISP1(config)#access-list 101 permit tcp any any eq 80

ISP1(config)#priority-list 1 protocol ip high list 101

ISP1(config)#access-list 102 permit ip any any

ISP1(config)#priority-list 1 protocol ip medium list 102

Step 5

You must now assign the priority list to the appropriate interface. Only one list can be assigned per

interface.

Singapore(config)#interface serial 0/0

Singapore(config-if)#priority-group 1

ISP1(config)#interface serial 0/0

ISP1(config-if)#priority-group 1

19 - 217 CCNP 1: Advanced Routing v 3.0 - Lab 1.5.1 Copyright  2003, Cisco Systems, Inc.

Step 2

Check the routing table on Vista using the show ip route command. Vista should have two routes

to network 10.0.0.0 in its table. Troubleshoot, if necessary.

RIP automatically performs load balancing using equal-cost routes. Notice that both routes have a

metric of 1. In this case, it is a hop count. RIP cannot perform unequal-cost load balancing. In the

next lab it will be seen that IGRP can perform unequal-cost load balancing.

Step 3

To configure Vista to load balance on a per packet basis, both S0/0 and S0/1 must use process

switching. Process switching forces the router to look in the routing table for the destination network

of each routed packet. In contrast, fast switching performs a table lookup for the first packet only.

The router then stores the result in a high speed cache and uses the cached information to forward

all additional packets to the same destination. Fast switching is the default setting.

Enable process switching on both of Vista serial interfaces with the following interface configuration

command:

Vista(config-if)#no ip route-cache

Verify that fast switching is disabled by using the show ip interface

command:

Vista#show ip interface s0/0

Serial0 is up, line protocol is up

Internet address is 192.168.1.1 255.255.255.0

Broadcast address is 255.255.255.255

Address determined by non-volatile memory

MTU is 1500 bytes

Helper address is not set

Directed broadcast forwarding is enabled

Outgoing access list is not set

Inbound access list is not set

Proxy ARP is enabled

Security level is default

Split horizon is enabled

ICMP redirects are always sent

ICMP unreachables are always sent

ICMP mask replies are never sent

IP fast switching is disabled

Step 4

Because there are two routes to the destination network in the table, half the packets will be sent

along one path, and half will travel over the other. The path selection alternates with each packet

received. Observe this process by using the debug ip packet command, which outputs

information about IP packets sent and received by the router:

Vista#debug ip packet

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