Specifications

Caveats for Cisco IOS Release 12.0

78-6455-12

Resolved Caveats—Cisco IOS Release 12.0(5)

• CSCdk92089

If you have Integrated Routing and Bridging (IRB) configured on a Cisco 4500 router with two

Token Ring interfaces (0 and 1) on bridge 1, when a PC is connected to interface 0 everything works

fine (the MAC is on the bridge table and pings are successful). However, as soon as you change the

connection to interface 1, the MAC does not show up on the bridge table and pings are not

successful. There is no workaround.

• CSCdm13938

If you use transparent bridging on a Catalyst 8540 multiservice ATM switch router, and attempt a

BOOTP, the “RARP” message from the client never reaches the server if the Bridge-Group Virtual

Interface (BVI) is defined. As soon as you remove the BVI126 interface, the “RARP” goes through

the Catalyst 8540, but the client will not finish booting. There is no workaround.

• CSCdm16052

In Cisco IOS Release 11.3(8.5)T, the RSM and RSP platforms that use a VIP2/PA-4R IBM2692

port adaptor will potentially ignore non-RIF Token Ring packets. This condition occurs because the

VIP Token Ring driver incorrectly classifies these packets as runts and drops them. This is a

regression and was introduced by CSCdk64195. There is no workaround.

• CSCdm16154

A VIP port adapter that is configured for encapsulation ISL 99 experiences a 30 to 70-percent

packet loss when pinging a host that is located on the same VLAN off of a directly connected

switch. The switch is configured to forward VLAN 1 -1005. The issue seems to be traffic related

(nature of the traffic, not amount), because the addition of certain VLANs on the switch trunk side

triggers it.

Workaround: Use Cisco IOS Release 12.0(3.3)S instead of Release 12.0(3.5)S, or clear the trunk

to contain only VLAN 99.

• CSCdm19165

A bridge filter might not filter out all the MAC addresses it should filter. There is no workaround.

• CSCdm36454

A Cisco 7200 series router running Cisco IOS Release 12.0(3.5) or later images will display the

following error message when a Fast Ethernet port adapter is removed from the chassis:

%SYS-2-BADSHARE: Bad refcount in retparticle, ptr=0, count=0

There is no workaround.

IP Routing Protocols

• CSCdk09082

Some types of incorrectly formed DNS packets might cause a Cisco router to reload. There is no

workaround.

• CSCdk78108

When using two EIGRP processes on a router, a directly connected network might end in an

internal loop after the link associated with that network goes down and up. This will result in a

routing failure to that network. There is no workaround.