Cisco CCNA / CCNP Certification Exam: Troubleshooting Direct Serial Connections
A 인스타그램 팔로워 늘리기 primary topic of one's CCNA and CCNP CIT exams are going to be connecting Cisco routers straight by means of their Serial interfaces, and when the configuration is straightforward, there are numerous critical details and exhibit commands you will need to know as a way to move the tests and configure this productively in generation and home lab networks. Permit’s Examine a sample configuration.
Connecting Cisco routers specifically by means of their Serial interfaces operates rather well as you get it functioning – and acquiring this type of link up and functioning is not hard enough. You may use demonstrate controller serial x to determine which endpoint is performing given that the DCE, and it’s the DCE that must be configured Together with the clockrate command.
R3#clearly show controller serial 1
High definition unit one, idb = 0x11B4DC, driver construction at 0x121868
buffer dimensions 1524 High definition device one, V.35 DCE cable
R3(config)#int serial1
R3(config-if)#ip tackle 172.12.13.three 255.255.255.0
R3(config-if)#clockrate 56000
R3(config-if)#no shut
Failure to configure the clockrate has some intriguing outcomes regarding the Bodily and reasonable point out with the interfaces. Permit’s get rid of the clockrate from R3 and see what occurs.
R3(config)#int s1
R3(config-if)#no clockrate 56000
R3(config-if)#
eighteen:02:19: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, adjusted https://en.wikipedia.org/wiki/?search=인스타 팔로워 구매 point out to down
The line protocol doesn’t fall quickly, nonetheless it does fall. Permit’s run show interface serial1 to match the Actual physical and rational interface states.
R3#display int serial1
Serial1 is up, line protocol is down
Physically, the interface is ok, And so the Actual physical interface is up. It’s just the sensible Portion of the interface – the line protocol – that may be down. It’s exactly the same scenario on R1.
R1#present inter serial1
Whilst a router misconfiguration is definitely the almost certainly cause of a serial connection challenge, that’s not the only real reason behind clocking challenges. Cisco’s Web-site documentation mentions CSU/DSU misconfiguration, out-of-spec cables, undesirable patch panel connections, and connecting a lot of cables together as other good reasons for clocking troubles. Continue to, the number one basis for clocking difficulties in my practical experience is simply forgetting to configure the clockrate command!