Specifications

60
Release Notes for Cisco IOS Release 12.0 S
78-7130-11 Rev. B0
Caveats
• CSCds20926
A router that is running Open Shortest Path First (OSPF) may reload during redistribution testing.
This situation has only been seen in development-testing environments, where different routing
protocols are configured and unconfigured quickly. Race conditions occur if these protocols are
redistributed into OSPF, which forces the router to reload. This situation does not occur in normal
operating environments where routing protocols are never removed. There is no workaround.
• CSCds26009
Using the summary-address router configuration command in Open Shortest Path First (OSPF)
may cause high CPU utilization. This situation occurs if the routing table is 10K or above.
Workaround: Remove the summary-address command.
• CSCds37837
Rate-based distributed Quality of Service (QoS) features such as traffic-shaping, Low Latency
Queueing (LLQ), and police do not report actually traffic rate after Compressed Real-Time Traffic
Protocol (CRTP) has compressed the packets. This situation may result in premature packet drops.
For example, if the compression efficiency is 2:1, and a given QoS feature has enough tokens for
two compressed packets, instead of being able to send a burst of two voice packets, the feature may
drop the second packet because it does not debit the tokens using the compressed size.
There is no workaround.
• CSCds39722
A Cisco router that has Cisco Express Forwarding (CEF) enabled may reload when sending
NetFlow export packets. There is no workaround.
• CSCds44496
A Border Gateway Protocol (BGP) UPDATE contains Network Layer Reachability Information
(NLRI) and attributes that describe the path to the destination. Each path attribute is a type, length,
value (TLV) object.
The type is a two-octet field that includes the attribute flags and the type code. The fourth
high-order bit (bit 3) of the attribute flag is the extended length bit. It defines whether the attribute
length is one octet (if set to 0) or two octets (if set to 1). BGP uses the extended length bit only if
the length of the attribute value is greater than 255 octets.
An optional, transitive attribute that is unknown to a BGP speaker must be stored and forwarded
when the path is sent in a BGP UPDATE. If the length of the attribute is such that the extended
length bit is used, its contents are truncated when the UPDATE is sent. There is no workaround.
• CSCds53104
A Cisco router may reload while changing an interface IP address if overlapping network statments
exist in the OSPF configuration that match this IP address.
Workaround: Remove extra network statements that match the old IP address.
Miscellaneous
• CSCdm62717
A Cisco 12000 series Gigabit Switch Router (GSR) line card might reload if there are a large
number of adjacency and prefix updates in a short period of time. This condition also affects
Versatile Interface Processor (VIP) line cards in the Cisco 7500/RSP series routers.
Workaround: Upgrade to Cisco IOS Release 12.1(10.5) or to a later release.