all: whenever i get a hick up on my T1 to the internet my router interface goes to a "serial 0/0 is down, line protocol is down". Once this happens I'm forced to reboot the router to get the interface back up. I do a 'no shut' but that
Solved: Hi, I just want to make sure... CRC errors are always exactly that on serials? We've been arguing with the carrier about the CRC errors on our links.... Are CRCs are always bad facilities/noise on the links? Is there anything else for us to
No, definitely not, chipk. I know line protocol down could very well be a cable problem I'm going on the fact that he said he has R2 to R3 working, and he took that cable from the working one and put it on the non-working one.
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You can identify five possible problem states in the interface status line of the show interfaces serial display (see Figure 15-1):
The output of the show interfaces serial exec command displays information specific to serial interfaces. Figure 15-1 shows the output of the show interfaces serial exec command for a High-Level Data Link Control (HDLC) serial interface.
There are two general buffer types on Cisco routers: hardware buffers and system buffers. Only the system buffers are directly configurable by system administrators. The hardware buffers are specifically used as the receive and transmit buffers associated with each interface and (in the absence of any special configuration) are dynamically managed by the system software itself.
1. Check hardware at both ends of the link (attach a breakout box or a serial analyzer, and test to determine the source of problems). 2. If an analyzer or breakout box is incapable of identifying any external problems, check the router hardware.
Output drops appear in the output of the show interfaces serial command (refer to Figure 15-1) when the system is attempting to hand off a packet to a transmit buffer but no buffers are available.
Step 1 Make sure that the cable between the interface port and the E1 service provider's equipment or E1 terminal equipment is connected correctly. Check to see whether the cable is hooked up to the correct ports. Correct the cable connections if necessary.
Table 15-5 describes the various types of input errors displayed by the show interfaces serial command (see Figure 15-1), possible problems that might be causing the errors, and solutions to those problems.
You can identify five possible problem states in the interface status line of the show interfaces serial display (see Figure 15-1):
The output of the show interfaces serial exec command displays information specific to serial interfaces. Figure 15-1 shows the output of the show interfaces serial exec command for a High-Level Data Link Control (HDLC) serial interface.
There are two general buffer types on Cisco routers: hardware buffers and system buffers. Only the system buffers are directly configurable by system administrators. The hardware buffers are specifically used as the receive and transmit buffers associated with each interface and (in the absence of any special configuration) are dynamically managed by the system software itself.
1. Check hardware at both ends of the link (attach a breakout box or a serial analyzer, and test to determine the source of problems). 2. If an analyzer or breakout box is incapable of identifying any external problems, check the router hardware.
Output drops appear in the output of the show interfaces serial command (refer to Figure 15-1) when the system is attempting to hand off a packet to a transmit buffer but no buffers are available.
Step 1 Make sure that the cable between the interface port and the E1 service provider's equipment or E1 terminal equipment is connected correctly. Check to see whether the cable is hooked up to the correct ports. Correct the cable connections if necessary.
Table 15-5 describes the various types of input errors displayed by the show interfaces serial command (see Figure 15-1), possible problems that might be causing the errors, and solutions to those problems.