1、HDLC配置命令
配置HDLC协议要先进入接口视图，然后用link-protocol将HDLC配置为链路层协议。配置的时候需要注意的是，链路两端的设备（路由器的接口）都需要配置为HDLC，否则无法通信。
设置HDLC协议轮询时间间隔，也应该进入接口视图，然后用timer hold seconds(0~32767)命令配置时间间隔，单位为秒。默认情况，接口的HDLC协议轮询时间间隔为10s.
2、HDLC示例
实验组网图如下：
首先配置RTA
<RT1>sys System View: return to User View with Ctrl+Z. [RT1]dis inter br The brief information of interface(s) under route mode: Link: ADM - administratively down; Stby - standby Protocol: (s) - spoofing Interface Link Protocol Main IP Description GE0/0/0 DOWN DOWN -- GE0/0/1 DOWN DOWN -- GE0/0/2 DOWN DOWN -- GE0/0/3 DOWN DOWN -- NULL0 UP UP(s) -- S0/1/0 UP UP -- S0/1/1 DOWN DOWN -- S0/1/2 DOWN DOWN -- S0/1/3 DOWN DOWN --
The brief information of interface(s) under bridge mode: Link: ADM - administratively down; Stby - standby Speed or Duplex: (a)/A - auto; H - half; F - full Type: A - access; T - trunk; H - hybrid Interface Link Speed Duplex Type PVID Description Eth0/4/0 DOWN 100M A A 1 Eth0/4/1 DOWN 100M A A 1 Eth0/4/2 DOWN 100M A A 1 Eth0/4/3 DOWN 100M A A 1 Eth0/4/4 DOWN 100M A A 1 Eth0/4/5 DOWN 100M A A 1 Eth0/4/6 DOWN 100M A A 1 Eth0/4/7 DOWN 100M A A 1
[RT1]inte s0/1/0 [RT1-Serial0/1/0]dis this（该命令是查看该接口是何协议） # interface Serial0/1/0 link-protocol ppp # return [RT1-Serial0/1/0]link-protocol hdlc [RT1-Serial0/1/0]timer hold 15 [RT1-Serial0/1/0]ip add 1.1.1.1 30 [RT1-Serial0/1/0]quit
然后RTB同样配置
<RT2>sys System View: return to User View with Ctrl+Z. [RT2]dis int br The brief information of interface(s) under route mode: Link: ADM - administratively down; Stby - standby Protocol: (s) - spoofing Interface Link Protocol Main IP Description GE0/0/0 DOWN DOWN -- GE0/0/1 DOWN DOWN -- GE0/0/2 DOWN DOWN -- GE0/0/3 DOWN DOWN -- NULL0 UP UP(s) -- S0/1/0 UP DOWN -- S0/1/1 DOWN DOWN -- S0/1/2 DOWN DOWN -- S0/1/3 DOWN DOWN --
The brief information of interface(s) under bridge mode: Link: ADM - administratively down; Stby - standby Speed or Duplex: (a)/A - auto; H - half; F - full Type: A - access; T - trunk; H - hybrid Interface Link Speed Duplex Type PVID Description Eth0/4/0 DOWN 100M A A 1 Eth0/4/1 DOWN 100M A A 1 Eth0/4/2 DOWN 100M A A 1 Eth0/4/3 DOWN 100M A A 1 Eth0/4/4 DOWN 100M A A 1 Eth0/4/5 DOWN 100M A A 1 Eth0/4/6 DOWN 100M A A 1 Eth0/4/7 DOWN 100M A A 1
[RT2]inter s0/1/0 [RT2-Serial0/1/0]dis this # interface Serial0/1/0 link-protocol ppp # return [RT2-Serial0/1/0]link-protocol hdlc [RT2-Serial0/1/0] %Oct 25 21:39:41:376 2018 RT2 IFNET/3/LINK_UPDOWN: Serial0/1/0 link status is DOWN. %Oct 25 21:39:41:376 2018 RT2 IFNET/3/LINK_UPDOWN: Serial0/1/0 link status is UP. [RT2-Serial0/1/0]timer hold 15 [RT2-Serial0/1/0]ip add 1.1.1.2 30 [RT2-Serial0/1/0]quit
检查路由器广域网之间的互通性
在RTA上同ping命令检查RTA与RTB之间的互通性
<RT1>ping 1.1.1.2 PING 1.1.1.2: 56 data bytes, press CTRL_C to break Reply from 1.1.1.2: bytes=56 Sequence=1 ttl=255 time=11 ms Reply from 1.1.1.2: bytes=56 Sequence=2 ttl=255 time=4 ms Reply from 1.1.1.2: bytes=56 Sequence=3 ttl=255 time=25 ms Reply from 1.1.1.2: bytes=56 Sequence=4 ttl=255 time=140 ms Reply from 1.1.1.2: bytes=56 Sequence=5 ttl=255 time=140 ms
--- 1.1.1.2 ping statistics --- 5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 4/64/140 ms
<RT1>
