Cisco OL-4015-08 Manual de usuario descargar pdf (Pagina 618)

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Cross-Platform Release Notes for Cisco IOS Release 12.0S

OL-1617-14 Rev. Q0

Caveats

Resolved Caveats—Cisco IOS Release 12.0(30)S

The symptom occurs because the Fast Ethernet interface that is configured for HSRP is not switched

to promiscuous mode when the HSRP group becomes active, preventing packets that are addressed

to the HSRP virtual MAC address from being received by the interface. The output of the show

controllers fastethernet user EXEC or privileged EXEC command displays whether the

promiscuous mode is enabled or disabled.

Reboot the router to restore the router to proper operation.

Workaround: To prevent the symptom from occurring, enter the standby use-bia interface

configuration command on the Fast Ethernet interface that is configured for HSRP.

Further Problem Description: This caveat only effects Fast Ethernet port adapters and network

modules that use the AMDP2 chipset (for example, the PA-2FEISL). When you use such a port

adapter or network module with HSRP configured and the interface goes down, HSRP does no

longer function when the interface comes back up.

• CSCed22303

Symptoms: The interface on an Engine 3 line card is stuck after hours of testing. When incoming

packets are ignored, PPP does not go up.

Conditions: This symptom is observed on Cisco 12000 series router after hours of testing with an

attenuator.

Workaround: Enter the shutdown command followed by the no shutdown command on the affected

interface.

• CSCed22358

Symptoms: A Cisco 12000 series may forward packets to an incorrect interface. This behavior can

been seen by looking at the hardware CEF entry on this input line card:

execute-on slot x show ip hardware-cef a.b.c.d

(a.b.c.d is the destination IP address)

The output looks similar to the following, in which the CEF lookup is null:

LC-Slot0#show ip hardware-cef a.b.c.d

Leaf FCR 2 0x784C6FC0 found 2 deep

alpha ip loadbalance: 0x78198D00 - lbl not equal. cef lookup NULL

After clearing the route, the output looks as follows:

LC-Slot0#show ip hardware-cef a.b.c.d

Leaf FCR 4 0x784C6FC0 found 2 deep

Fast Adjacency:

alpha adjacency: 0x701E8280

[0-7] oi 0x4019100 oq 4000 in 15 ab 0 hl 20 gp 11 tl 0 loq BC01 15/0 mtu 4470

packets 1750013440 bytes 776867999767

Output Queue / Local Output Queue Bundle:

[0-7] output queue 0x4000 local output queue 0xBC01

This problem may cause packets to be dropped because a loop is created and the TTL expires for

the packets.

Conditions: This symptom is observed under very specific conditions on a Cisco 12000 series that

runs Cisco IOS Release 12.0(24)S or a later release when traffic that enters an Engine 3 line card

toggles between a static-to-null route and a more specific route as the destination.

Workaround: Avoid the specific conditions mentioned above. Clearing the route resolves the

problem only temporarily.

• CSCed47560

Symptoms: The native Gigabit Ethernet ports of a Cisco 7200 series NPE-G1 or a Cisco 7301 may

stop forwarding traffic.

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