Cisco Cisco IOS Software Release 12.4(23) Notas de publicación
666
Caveats for Cisco IOS Release 12.4
OL-7656-15 Rev. J0
Resolved Caveats—Cisco IOS Release 12.4(7)
Conditions: This symptom is observed on a Cisco 12000 series that is configured for BGP and that
is connected to a third-party vendor router after the BGP authentication password is changed on the
Cisco 12000 series.
is connected to a third-party vendor router after the BGP authentication password is changed on the
Cisco 12000 series.
Workaround: Identify the BGP connection which is staled with the command sh tcp brie and then
clear the TCP contol block with the command clear tcp tcb tcb_number to delete the stuck BGP
connection.
clear the TCP contol block with the command clear tcp tcb tcb_number to delete the stuck BGP
connection.
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CSCsc39357
Symptoms: A Cisco router may drop a TCP connection to a remote router.
Conditions: This symptom is observed when an active TCP connection is established and when data
is sent by the Cisco router to the remote router at a much faster rate than what the remote router can
handle, causing the remote router to advertise a zero window. Subsequently, when the remote router
reads the data, the window is re-opened and the new window is advertised. When this situation
occurs, and when the Cisco router has saved data to TCP in order to be send to the remote router,
the Cisco router may drop the TCP connection.
is sent by the Cisco router to the remote router at a much faster rate than what the remote router can
handle, causing the remote router to advertise a zero window. Subsequently, when the remote router
reads the data, the window is re-opened and the new window is advertised. When this situation
occurs, and when the Cisco router has saved data to TCP in order to be send to the remote router,
the Cisco router may drop the TCP connection.
Workaround: Increase the window size on both ends to alleviate the symptom to a certain extent. On
the Cisco router, enter the ip tcp window-size bytes command. When you use a Telnet connection,
reduce the screen-length argument in the terminal length screen-length command to 20 or 30 lines.
the Cisco router, enter the ip tcp window-size bytes command. When you use a Telnet connection,
reduce the screen-length argument in the terminal length screen-length command to 20 or 30 lines.
Further Problem Description: BGP in Cisco IOS Release 12.0S and Release 12.4 is not affected
because the retransmit timeout is disabled for BGP in these releases.
because the retransmit timeout is disabled for BGP in these releases.
Wide-Area Networking
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CSCed52110
Symptoms: IP header compression does not function for FR PVC-Bundles.
Conditions: This symptom is observed when IP header compression is configured for Frame Relay
PVC bundles.
PVC bundles.
Workaround: There is no workaround.
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CSCee75882
Symptoms: A GEIP+ may crash unexpectedly.
Conditions: This symptom is observed on a Cisco 7500 series when the Gigabit Ethernet interface
is transmitting a large amount of traffic and the tx_ring fills up.
is transmitting a large amount of traffic and the tx_ring fills up.
Workaround: Reduce traffic load.
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CSCeg77994
Symptoms: A LAC does not send an Accounting-Start RADIUS record to a RADIUS server for a
user session.
user session.
Conditions: This symptom is observed on a Cisco platform that functions as a LAC and that runs
Cisco IOS Release 12.3(14)T1 when a switchover occurs from one LNS to another LNS while the
user session is brought up.
Cisco IOS Release 12.3(14)T1 when a switchover occurs from one LNS to another LNS while the
user session is brought up.
Workaround: There is no workaround.
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CSCeh58376
Symptoms: A serial interface on a channelized port adapter may stop forwarding traffic through the
router but traffic to and from the router over the interface may still go through. The Tx accumulator
"value" counter in the output of the show controllers cbus Exec command does not exceed the value
2, as is shown in the following example:
router but traffic to and from the router over the interface may still go through. The Tx accumulator
"value" counter in the output of the show controllers cbus Exec command does not exceed the value
2, as is shown in the following example: