When connecting two Cisco routers directly with a DCEDTE cable, the router which has the DCE end of the cable connected to it has to be configured to dictate the clock rate.Additionally you could configure authentication on the interface if you changed the encapsulation.
If youd like to find out how configure authentication on serial interfaces, have a look at these tutorials: Configuring PPP Authentication Method1 Configuring PPP Authentication Method2. By default Cisco routers use HDLC as encapsulation method on all synchronous serial interfaces. ![]() You can see from this output the R1 is the DTE so no clock rate configuration is required. Mar 1 11:01:18.570: LINK-3-UPDOWN: Interface Serial00, changed state to down. Note that even though the interface has been enabled, its state stays down until a router on the other end comes up. Mar 1 16:06:09.264: LINK-3-UPDOWN: Interface Serial00, changed state to up. Mar 1 16:06:10.266: LINEPROTO-5-UPDOWN: Line protocol on Interface Serial00, changed state to up. Mar 1 16:06:10.442: Serial00: HDLC myseq 0, mineseen 0, yourseen 0, line up. Mar 1 16:06:20.442: Serial00: HDLC myseq 1, mineseen 1, yourseen 1, line up. Mar 1 16:06:27.438: CDP-EV: Lookup for ip phone with idb Serial00 ip 192.168.1.1 mac 0000.0000.0000 platform. Because we enabled cdp debugging as well, we can see some info about the new neighbour too. Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds. Success rate is 100 percent (55), round-trip minavgmax 161616 ms. Well assume youre ok with this, but you can opt-out if you wish. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. But opting out of some of these cookies may have an effect on your browsing experience. This category only includes cookies that ensures basic functionalities and security features of the website. It is mandatory to procure user consent prior to running these cookies on your website.
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