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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(33)S6

• CSCsz70552

Symptoms: On the “P” router with four POS links, where two links are working as the primary and

two links are working for redundancy; after a telco issue, both POS links go down due to

transmission problems. The trigger for this issue is both links going down.

The P router sets LIB local binding changes to implicit null for several prefixes. After that, the PE

routers have connectivity issues in some VRFs and do not go through a backup path using POS

interface.

Looking into the PE routers that are connected to this P router, the following deviation was observed

in their LFIB tables:

Router_PE# sh mpls for 10.38.193.192 de

Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched

interface 37 Pop tag 10.38.193.192/32 0 Gi3/0 10.125.93.222 MAC/Encaps=30/30,

MRU=1530, Tag Stack{} 0000000000000000000000010100000000055FFF99FE000197D0ED808847 No

output feature configured

Router_PE# sh ip cef 10.38.193.192 de

10.38.193.192/32, version 72378, epoch 0, cached adjacency 10.125.93.222 0 packets, 0

bytes tag information set, shared, all rewrites owned local tag: 37 via 10.125.93.222,

GigabitEthernet3/0, 3 dependencies next hop 10.125.93.222, GigabitEthernet3/0 valid

cached adjacency tag rewrite with Gi3/0, 10.125.93.222, tags imposed {}

It looks as though the P router sends a pop to the PE routers.

Conditions: This symptom is observed under the following conditions:

–

The P router has two links to the primary path and two links to the backup path.

–

PPP encapsulation is used.

Workaround:

–

Change from PPP to HDLC encapsulation on the POS links.

–

Enter the “clear ip route <prefix>” command.

–

Enter the “clear ip route *” command.

• CSCsz71787

Symptoms: A router crashes when it is configured with DLSw.

Conditions: A vulnerability exists in Cisco IOS software when processing UDP and IP protocol 91

packets. This vulnerability does not affect TCP packet processing. A successful exploitation may

result in a reload of the system, leading to a denial of service (DoS) condition.

Cisco IOS devices that are configured for DLSw with the <cmd>dlsw local- peer</cmd>

automatically listen for IP protocol 91 packets. A Cisco IOS device that is configured for DLSw with

the <cmd>dlsw local-peer peer-id <IP- address></cmd> command listen for IP protocol 91 packets

and UDP port 2067.

Cisco IOS devices listen to IP protocol 91 packets when DLSw is configured. However, it is only

used if DLSw is configured for Fast Sequenced Transport (FST). A DLSw FST peer configuration

will contain the following line:

<cmd>dlsw remote-peer 0 fst <ip-address></cmd>

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