Download Cisco Fourth-Generation Versatile Interface Processor VIP4 Specifications

Caveats
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CSCdp86111
When Cisco Express Forwarding (CEF) is configured as part of a large configuration (typically with
access lists), following boot traffic that is directly addressed to the interfaces of a router might not
be received. This condition can be observed on enabled interfaces where IP interfaces appear to be
up, but the CEF interfaces are down.
Workaround: Perform one of the following steps.
– Boot without CEF enabled.
– Disable and then re-enable CEF.
– Enter the no shutdown command on each of the interfaces that are effected.
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CSCdp91476
The fix for this DDTS adds a 32-bit overflow counter that can be used in conjunction with the
existing 32-bit counter to get the full 64-bit value. In addition, a true 64-bit counter has also been
added to the MIB. SNMP v1 managers and Cisco IOS Release 11.X releases are limited to using
the 32-bit overflow counters; the 64-bit counters will be invisible to them. SNMP v2 and SNMP v3
managers that are running on top of Cisco IOS Release 12.X releases will be able to use either the
32-bit overflow counters or the 64-bit counters.
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CSCdr01116
A Cisco 12000 Gigabit Switch Router (GSR) that is configured for 802.1Q trunking over a Gigabit
Ethernet interface might not form OSPF or EIGRP adjacencies when ip route-cache flow is
configured on the main Gigabit Ethernet interface.
Workaround: Configure and use Gigabit Ethernet subinterfaces or disable flow switching by
entering the no ip route-cache flow command.
TCP/IP Host-Mode Services
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CSCdp63037
Border Gateway Protocol (BGP) sessions on Cisco 12000 series Gigabit Switch Router (GSR)
might fail to send updates when the router establishes passive BGP sessions because of problems
with the flow control of BGP and TCP.
Workaround: Use an inbound Access Control List (ACL) to deny any traffic destined for the port,
and always open the session actively.
Wide-Area Networking
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CSCdp51767
A Cisco 7500 series Route Switch Processor (RSP) with a VIP2-50 Versatile Interface Processor
and a PA-A3 port adapter might not react to available bit rate (ABR) explicit rate (ER) congestion
marking. In this situation, the output rate of an ABR connection does not decrease upon the
reception of a Resource Management (RM) cell with an ER field value that is lower than the CCR
value. There is no workaround.
Release Notes for Cisco IOS Release 12.0 S
78-7130-11 Rev. B0
95