Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Manual de usuario descargar pdf (Pagina 163)

609

Caveats for Cisco IOS Release 12.2(33)SRD through 12.2(33)SRD8

OL-10394-05 Rev. R0

• CSCsw16698

Symptoms: New DHCP clients are not able to get IP address from DHCP server via DHCP relay on

the router. Existing clients are unable to renew their IP addresses

Other Symptoms:

1.1 When we’re trying to display DHCP bindings with “show ip dhcp binding” command the

following message is observed:

% The DHCP database could not be locked. Please retry the command later.

1.2 Command “ip dhcp database” disappeared from the running configuration.

1.3 Output of “show run” is delayed.

1.4 Output of “debug ip dhcp events” show the following when a new DHCP packet is received:

DHCPD: dhcpd_receive_packet: unable to lock semaphore to check for pre-existing bindings could

not lock se. DHCPD: dhcpd_timer_process could not lock semaphore. DHCPD:

dhcp_server_receive could not lock semaphore.

2.1. This bug may also cause DHCP Snooping failure. In this case, the output of the show ip dhcp

snooping database command constantly shows these lines:

Agent Running : Yes Delay Timer Expiry : 0 (00:00:00) Abort Timer Expiry : Not Running

Conditions: Occurs when DHCP and/or DHCP Snooping database agent is configured to store

bindings on a TFTP server, and then the database files are not present or are read-only for some time

on TFTP server while the router tries to write to them.

Workaround: Before the issue occurs, there are three known alternatives to avoid this problem:

1. Either configure “length 0” for line console 0;

2. Or - log in via console at least once since router startup;

3. Or - use Cisco IOS Release 12.2(33)SRD but do not enable “debug tftp packet”.

To fix the issue after it has occurred, connect to the router via console, press space bar to get rid of

“--More--” prompt, then press enter to log in

• CSCsw24542

Symptoms: A router may crash due to a bus error after displaying the following error messages:

%DATACORRUPTION-1-DATAINCONSISTENCY: copy error, %ALIGN-1-FATAL: Illegal access to a

low address < isdn function decoded>

Conditions: The symptom is observed on a Cisco 3825 router that is running Cisco IOS Release

12.4(22)T with ISDN connections.

Workaround: There is no workaround.

Further Problem Description: When copying the ISDN incoming call number for an incoming call

from Layer2, the length of the call number was somehow exceeding the maximum allocated buffer

size (80). PBX has pumped a Layer2 information frame with call number exceeding the maximum

number length limit. It leads to memory corruption and a crash.

• CSCsw24611

Symptoms: A router configured with BGP and VPN import may crash.

Conditions: This is a hard to hit race condition. BGP imports a path from VRF-A to VRF-B. The

following steps have to take place in exactly this order for the crash to occur: 1. The next-hop for

the path has to become unreachable. 2. BGP has to re-evaluate the bestpath on the net in VRF-A and

result in no-bestpath on the net (because there is no alternative path available). 3. RIB installation

has to process the importing BGP net under VRF-B.

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