Specifications

66
Release Notes for Cisco IOS Release 12.0 S
78-7130-11 Rev. B0
Caveats
• CSCds46872
Configuring IP accounting on a Cisco 12000 series Gigabit Switch Router (GSR) by entering the
ip accounting interface configuration command halts all traffic through the router. This situation
does not occur if the ip accounting mac-address command is used.
Workaround: Use the ip accounting mac-address command.
• CSCds49677
The number of adjacencies a Gigabit Ethernet line card will support in this release is 32k without
802.1Q and 21k with 802.1Q. If this number of adjacencies is exceeded, the router displays error
messages similar to the following:
GRP-3-ENCAP: Failure to allocate, slot X (info 0x22)
You can see the number of adjacencies by entering the show adjacency [summary] command.
Entering the clear arp command normally reduces the number of adjacencies until each end device
is required through ARP. There is no workaround.
• CSCds55488
Multiprotocol Label Switching (MPLS) ATM Tag Distribution Protocol (TDP) bindings may
continuously flap between active and released states under certain stressful situations when
Cisco IOS Release 12.0(13)S or previous versions of Cisco IOS Release 12.0 S are running. There
is no workaround.
• CSCds58727
On a Cisco 7513 router, pings may fail through Multiprotocol Label Switching Traffic Engineering
(MPLS TE) unidirectional tunnels when Cisco Express Forwarding (CEF) is configured. There is
no workaround.
• CSCds61573
When an OC-3 ATM line card is configured with the egress Committed Access Rate (CAR), traffic
is not forwarded if the receive (Rx) line card is a 3-port Gigabit Ethernet line card. There is no
workaround.
• CSCds69928
On a Cisco 7500/RSP series router that is running Cisco IOS Release 12.0(13.6)S or 12.0(13.6)S1,
when a service policy is attached to an ATM or Frame Relay VC, class-map statistics are correct,
but feature statistics (for example, bandwidth or polic) are all zeros.
Workaround: Attach a service policy to ATM or Frame Relay subinterfaces.
TCP/IP Host-Mode Services
• CSCdk69541
If a Cisco router is running Cisco IOS Release 12.0 S and the “ip tcp path-mtu-discovery” feature
is enabled, the router might experience a TCP timer problem and reload. This situation occurs when
the router is experiencing a heavy load that includes a large number of Border Gateway Protocol
(BGP) peer routers that are exchanging routing packets.
Workaround: Disable the "ip tcp path-mtu-discovery" feature by entering the no ip tcp
path-mtu-discovery command.