Cisco Cisco IOS Software Release 12.0 S

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When a multilink bundle is flapped under heavy traffic, there may be “output stuck” conditions on 
some of the member links of the bundle. There is no workaround. 

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Under very high traffic conditions, the Gigabit interface on a Cisco 7200 series router may stop 
transmitting packets, and the output queue remains stuck at 40/40. 

Workaround: Enter the clear interface gigabit x/0 command or the shutdown command followed 
by the no shutdown command.

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A Cisco Versatile Interface Processor 2-50 (VIP2-50) or VIP4-80 may reload under the following 
conditions:

There is an MC-T3 or MC-2T3+ port adapter in one slot of the VIP.

Traffic is sent through the port adapter at close to the line rate.

There is no workaround.

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Removing side A of a DPT48 node removes the whole node from the Dynamic Packet Transport 
(DPT) ring. The normal behavior should be that the DPT node should be able to work in wrap mode 
with just one card. This functionality functions properly when the side B card of a DPT48 node is 
removed, and the side A functions by itself. However, if the side B card is not taken out of the 
backplane and the card A is removed, the DPT node no longer functions properly and cannot 
continue its functionality in a wrapped state. There is no workaround.

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A Cisco router may reload with a bus error after the snmp-server enable traps atm pvc global 
configuration command is entered. There is no workaround.

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On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(13)S or 12.0(14)S 
with Engine 0 line cards, Simple Network Management Protocol (SNMP) counters (for example, 
ifOutOctets/ifHCOutOctets) may actually decrement. The counters usually decrement for no longer 
than 10 seconds. This situation may cause difficulties in polling these SNMP counters more 
frequently. 

Workaround: Extend the polling period for SNMP counters.

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When output Per Interface Rate Control (PIRC) is configured on a 3-Port Gigabit Ethernet line card, 
multicast traffic that is going out this line card does not get rate limited. There is no workaround.

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A Cisco Gigabit Route Processor (GRP) may reload in a loop after failover because of memory 
corruption. This situation occurs when there are two GRPs. There is no workaround.

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A Versatile Interface Processor (VIP) on a Cisco 7500/RSP series router that is running Cisco IOS 
Release 12.1(5a)E4 may reload with the following error message:

%ALIGN-1-FATAL: Illegal access to a low address

This situation has only been observed on Frame Relay interfaces with distributed Quality of Service 
(QoS) enabled. There is no workaround.