一个基于帧中继的虚电路分流的实验
一个基于帧中继的虚电路分流的实验
////////////////////////////////////////////////////////////////////////
R1#sh ip int br
Interface IP-Address OK? Method Status Protocol
Serial1/1 unassigned YES manual up up
Serial1/1.100 172.16.1.1 YES manual up up
Serial1/1.200 172.16.2.1 YES manual up up
Loopback0 10.1.1 .1 YES manual up up
/////////////////////////////////////////////////////////////////////////
R3#sh ip int br
Interface IP-Address OK? Method Status Protocol
Serial1/0 unassigned YES manual up up
Serial1/0.101 172.16.1.2 YES manual up up
Serial1/0.201 172.16.2.2 YES manual up up
Loopback0 10.1.2 .1 YES manual up up
/////////////////////////////////////////////////////////////////////////
步骤一：配置
R2
的为帧中继交换机。
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R2(config)#frame-relay switching
[s1]
R2(config)#interface serial 1/0
R2(config-if)#encapsulation frame-relay
R2(config-if)#frame-relay intf-type dce
R2(config-if)#frame-relay lmi-type cisco
R2(config-if)#frame-relay route 100 interface serial 1/1 101
R2(config-if)#frame-relay route 200 interface serial 1/1 201
[l2]
R2(config-if)#clock rate 64000
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface serial 1/1
R2(config-if)#encapsulation frame-relay
R2(config-if)#frame-relay intf-type dce
R2(config-if)#frame-relay lmi-type ansi
R2(config-if)#frame-relay route 101 interface serial 1/0 100
R2(config-if)#frame-relay route 201 interface serial 1/0 200
R2(config-if)#clock rate 64000
R2(config-if)#no shutdown
R2(config-if)#exit
R2#sh frame route
[l3]
Input Intf Input Dlci Output Intf Output Dlci Status
Serial1/0 100 Serial1/1 101 active
Serial1/0 200 Serial1/1 201 active
Serial1/1 101 Serial1/0 100 active
Serial1/1 201 Serial1/0 200 active
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步骤二
：
配置
R1
路由器
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R1(config)#int s1/1
R1(config-if)#encapsulation frame-relay
R1(config-if)#no ip addr
R1(config-if)#no sh
R1(config-if)#exit
R1(config)#int s1/1.100 point-to-point
R1(config-subif)#ip address 172.16.1.1 255.255.255.0
R1(config-subif)#frame-relay interface-dlci 100
R1(config-fr-dlci)#exit
R1(config-subif)#exit
R1(config)#
R1(config)#int s1/1.200 point-to-point
R1(config-subif)#ip add 172.16.2.1 255.255.255.0
R1(config-subif)#frame-relay interface-dlci 200
R1(config-fr-dlci)#exit
R1(config-subif)#exit
R1(config)#
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步骤三：配置
R3
路由器
|
R3(config)#int s1/0
R3(config-if)#encapsulation frame-relay
/*R3(config-if)#frame-relay lmi-type ansi
[s4]
*/
R3(config-if)#no ip addr
R3(config-if)#no sh
R3(config-if)#exit
R3(config)#int s1/1.101 point-to-point
R3(config-subif)#ip add 172.16.1.2 255.255.255.0
R3(config-subif)#frame-relay interface-dlci 101
R3(config-fr-dlci)#exit
R3(config-subif)#exit
R3(config)#
R3(config)#int s1/1.201 point-to-point
R3(config-subif)#ip add 172.16.2.2 255.255.255.0
R3(config-subif)#frame-relay interface-dlci 201
R3(config-fr-dlci)#exit
R3(config-subif)#exit
R3(config)#
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步骤四：在
R1
使用
show frame-realy lmi
查看
LMI
的信令状态信息
|
R1#sh frame-relay lmi
LMI Statistics for interface Serial1/1 (Frame Relay DTE) LMI TYPE = CISCO
Invalid Unnumbered info 0 Invalid Prot Disc 0
Invalid dummy Call Ref 0 Invalid Msg Type 0
Invalid Status Message 0 Invalid Lock Shift 0
Invalid Information ID 0 Invalid Report IE Len 0
Invalid Report Request 0 Invalid Keep IE Len 0
Num Status Enq. Sent 716 Num Status msgs Rcvd 717
Num Update Status Rcvd 0 Num Status Timeouts 0R1#
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步骤五：在
R1
上查看
map
|
R1#sh frame-relay map
Serial1/1.200 (up): point-to-point dlci, dlci 200(0xC8,0x3080), broadcast
status defined, active
Serial1/1.100 (up): point-to-point dlci, dlci 100(0x64,0x1840), broadcast
status defined, active
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步骤六：在
R3
上查看反向
ARP
|
R3#sh frame-relay map
Serial1/0.201 (up): point-to-point dlci, dlci 201(0xC9,0x3090), broadcast
status defined, active
Serial1/0.101 (up): point-to-point dlci, dlci 101(0x65,0x1850), broadcast
status defined, active
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步骤七：在
R1
上
ping R3
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R1#ping 172.16.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/61/120 ms
R1#ping 172.16.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 56/67/96 ms
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我来看看数据怎么走的。
R1#traceroute 10.1.2 .1
Type escape sequence to abort.
Tracing the route to 10.1.2 .1
1 172.16.1.2 8 msec * 16 msec
R3#traceroute 10.1.1 .1
Type escape sequence to abort.
Tracing the route to 10.1.1 .1
1 172.16.1.1 552 msec * 80 msec
说明数据默认是从其中一条
PVC
走的。
//////////////////////////////////////////////////////////////////////////
设置路由的
metric
来看看能不能分流，
R1(config)#ip route 10.1.2 .0 255.255.255.0 172.16.1.2
R1(config)#ip route 10.1.2 .0 255.255.255.0 172.16.2.2 2
R3(config)#ip route 10.1.1 .0 255.255.255.0 172.16.1.1 2
R3(config)#ip route 10.1.1 .0 255.255.255.0 172.16.2.1
来看看现在数据从那条路走，能不能来和去的时候走不同的
PVC
R1#traceroute 10.1.2 .1
Type escape sequence to abort.
Tracing the route to 10.1.2 .1
1 172.16.1.2 140 msec * 56 msec
R3#traceroute 10.1.1 .1
Type escape sequence to abort.
Tracing the route to 10.1.1 .1
1 172.16.2.1 96 msec * 64 msec
算是实现了简单的分流：
意外发现
：
在
R1
上
PING
上自己的接口
IP
。是否可以
PING
通？为什么？如果解决？
原来是不通的，现在通了。可能真好验证了某高手上次提出的论点。还发现
Ping
一次
会有
12
个包。
R3#sh interfaces stats
Serial1/0
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 1513 108988 1512 105889
Route cache 9 936 9 936
Total 1522 109924 1521 106825
R3#sh interfaces stats
Serial1/0
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 1523 109873 1523 107063
Route cache 9 936 9 936
Total 1532 110809 1532 107999
还抓个包。有空研究一下帧结构
[s1]
启用
frame-relay
[l2]
map
[l3]
j
检查
route
是对的。
[s4]
低于
11.2
的版本的
IOS
无法自动感知帧中继交换机所使用的
LMI
信令类型，所以需要手动的配置。