Specifications

Release Notes for Cisco IOS Release 12.0 S

78-7130-11 Rev. B0

Caveats

• CSCdp74038

On Gigabit Ethernet line cards, 802.1Q packets that are 512 bytes and larger might get dropped on

input. There is no workaround.

• CSCdp74616

On the Cisco OC-48c/STM-16c and Cisco QOC-12 line cards for the Cisco 12000 series Gigabit

Switch Router (GSR), there is a timing problem during initialization that might cause the line cards

to reload if Multiprotocol Label Switching (MPLS) packets are received before the initialization is

complete. There is no workaround.

• CSCdp78781

A memory leak in a Cisco 12000 series Gigabit Switch Router (GSR) line card in the Cisco Express

Forwarding (CEF) line card statistics might not clear quickly and exhibit high memory utilization.

In this situation, the router exhibits the following stack trace:

glc1-lc-m.120-8.3.S.symbols read in Enter hex value: 400A0314 400A1DC0 4027D3EC

40279794 4009AA6C 4009AA58 0x400A0314:report_malloc_failure(0x400a02d4)+0x40

0x400A1DC0:malloc(0x400a1aa4)+0x31c

0x4027D3EC:fib_collect_frpvc_rxstats(0x4027d3b4)+0x38

0x40279794:fib_lc_stats_background(0x402796c0)+0xd4

0x4009AA6C:r4k_process_dispatch(0x4009aa58)+0x14

0x4009AA58:r4k_process_dispatch(0x4009aa58)+0x0

Workaround: Limit the size of the access lists, or do not use access lists.

• CSCdp80282

Packets that are sourced from a Cisco 7500 series router with Multiprotocol Label Switching

(MPLS) enabled and exit the router through a T1 or Channelized T1 connection will not be sent

correctly. Other traffic traversing the router is not affected. There is no workaround.

• CSCdp82125

A Route Switch Processor (RSP)-based router with one or more Versatile Interface Processors

(VIPs) that is running Cisco IOS Release 12.0 S (or any image with tag support) might experience

a memory leak with Cisco Express Forwarding (CEF) and tag switching enabled and the no ip

route-cache distributed command configured. This memory leak can be detected by repeatedly

entering the show process memory | include OSPF command on the RSP console or vty.

Workaround: Enable distributed CEF instead of CEF, or turn off tag switching.

• CSCdp88204

If the tx-ring-limit command is entered on a Cisco 7500 series Route Switch Processor (RSP) that

is running Cisco IOS Release 12.0 S, the router might experience a NULL pointer access, and the

Versatile Interface Processor (VIP) might reload. This situation occurs during line flapping and

when the router is being configured. There is no workaround.

• CSCdp89965

Under rare circumstances, a tunnel might have a drop adjacency on the line card while

simultaneously having a valid adjacency on the on the Route Processor (RP).

Workaround: Enter the clear cef linecard command to download the correct information to the line

card.