Cisco Cisco IOS Software Releases 12.2 MC
15
Release Notes for Cisco MGX-RPM-1FE-CP Back Card for Cisco IOS Release 12.2(15)MC2g
OL-2920-12
Troubleshooting
Further details and the workarounds to mitigate the effects are explained in the Security Advisory
which is available at the following URL:
which is available at the following URL:
.
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CSCec21937
Description: When the MGX-RPM-1FE-CP FastEthernet interface is administratively shut down,
for directly connected devices, the interface still appears to be up.
for directly connected devices, the interface still appears to be up.
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CSCec25430
Description: A Cisco device reloads on receipt of a corrupt CDP packet.
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CSCed40563
Description: Problems with the CDP protocol have been resolved.
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CSCin67568
Description: A Cisco device experiences a memory leak in the CDP process. The device sending
CDP packets sends a hostname that is 256 or more characters. There are no problems with a
hostname of 255 or fewer characters.
CDP packets sends a hostname that is 256 or more characters. There are no problems with a
hostname of 255 or fewer characters.
Troubleshooting
This section contains the following MGX-RPM-1FE-CP troubleshooting information:
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Collecting Data for Back Card and Router Issues
To collect data for reporting back card and router issues, issue the following commands:
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show tech-support—Displays general information about the router when it reports a problem.
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show logging—Displays information in the syslog history table.
Modifying the MLP Reorder Buffer
When PPP multiplexing is disabled on the inbound direction of a MWR 1941-DC multilink, there are
many more packets to reorder. Therefore, we recommend that you modify the MLP reorder buffer using
the ppp multilink slippage interface configuration commands to avoid discarded fragments due to
buffer overflow.
many more packets to reorder. Therefore, we recommend that you modify the MLP reorder buffer using
the ppp multilink slippage interface configuration commands to avoid discarded fragments due to
buffer overflow.
Slippage is the amount by which data arriving on one link in a multilink bundle might lag behind data
transmitted over another link in that bundle. The amount of slippage might be expressed as a direct byte
count, but it is also commonly expressed as a measure of time, in terms of the differential delay between
the links.
transmitted over another link in that bundle. The amount of slippage might be expressed as a direct byte
count, but it is also commonly expressed as a measure of time, in terms of the differential delay between
the links.
A small amount of slippage between links is normal. Whenever slippage occurs, the multilink input
process must buffer fragment data arriving on the faster channels until it receives all expected fragments
on the remaining links, so that it can sort the fragments back into proper order, reassemble datagrams as
necessary, and then deliver the datagrams in proper order to the higher network layers (multilink
fragments include sequence numbers so that the multilink receiver can readily detect when packets are
process must buffer fragment data arriving on the faster channels until it receives all expected fragments
on the remaining links, so that it can sort the fragments back into proper order, reassemble datagrams as
necessary, and then deliver the datagrams in proper order to the higher network layers (multilink
fragments include sequence numbers so that the multilink receiver can readily detect when packets are