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  • Hub You - Cisco CCNA / CCNP Certification Exam: Troubleshooting Direct Serial Connections

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    configure the clockrate has some interesting effects regarding the physical and logical state of the interfaces. Let's remove the clockrate from R3 and see
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    Connecting Cisco routers directly via their Serial interfaces works really well once you get it running - and getting such a connection up and running is easy enough. You can use show controller serial x to find out which endpoint is acting as the DCE, and it's the DCE that must be configured with the clockrate command.

    R3#show controller serial 1

    HD unit 1, idb = 0x11B4DC, driver structure at 0x121868

    buffer size 1524 HD unit 1, V.35 DCE cable

    R3(config)#int serial1

    R3(config-if)#ip address 172.12.13.3 255.255.255.0

    R3(config-if)#clockrate 56000

    R3(config-if)#no shut

    Failure to configure the clockrate has some interesting effects regarding the physical and logical state of the interfaces. Let's remove the clockrate from R3 and see w

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    enough. You can use show controller serial x to find out which endpoint is acting as the DCE, and it's the DCE that must be configured with the clockrate command.

    R3#show controller serial 1

    HD unit 1, idb = 0x11B4DC, driver structure at 0x121868

    buffer size 1524 HD unit 1, V.35 DCE cable

    R3(config)#int serial1

    R3(config-if)#ip address 172.12.13.3 255.255.255.0

    R3(config-if)#clockrate 56000

    R3(config-if)#no shut

    Failure to configure the clockrate has some interesting effects regarding the physical and logical state of the interfaces. Let's remove the clockrate from R3 and see

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    R3#show controller serial 1

    HD unit 1, idb = 0x11B4DC, driver structure at 0x121868

    buffer size 1524 HD unit 1, V.35 DCE cable

    R3(config)#int serial1

    R3(config-if)#ip address 172.12.13.3 255.255.255.0

    R3(config-if)#clockrate 56000

    R3(config-if)#no shut

    Failure to configure the clockrate has some interesting effects regarding the physical and logical state of the interfaces. Let's remove the clockrate from R3 and see

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    3(config)#int serial1

    R3(config-if)#ip address 172.12.13.3 255.255.255.0

    R3(config-if)#clockrate 56000

    R3(config-if)#no shut

    Failure to configure the clockrate has some interesting effects regarding the physical and logical state of the interfaces. Let's remove the clockrate from R3 and see

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    configure the clockrate has some interesting effects regarding the physical and logical state of the interfaces. Let's remove the clockrate from R3 and see what happens.

    R3(config)#int s1

    R3(config-if)#no clockrate 56000

    R3(config-if)#

    18:02:19: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed state to down

    The line protocol doesn't drop immediately, but it does drop. Let's run show interface serial1 to compare the physical and logical interface states.

    R3#show int serial1

    Serial1 is up, line protocol is down

    Physically, the interface is fine, so the physical interface is up. It's only the logical part of the interface - the line protocol - that is down. It's the same situation on R1.

    R1#show inter serial1

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