Specifications
87
Release Notes for Cisco IOS Release 12.0 S
78-7130-11 Rev. B0
Caveats
• CSCdr16178
When an access control list (ACL) is applied to an interface and the ACL has destination prefixes
in it that are more specific than a route that is learned recursively, packets that match the ACL entry
with that destination prefix will not be routed correctly in the “permit” case.
For example, if there are the following static routes:
ip route 70.0.0.0 255.0.0.0 pos 1/0 ip route 80.0.0.0 255.0.0.0 70.1.1.1 ip route
90.0.0.0 255.0.0.0 80.1.1.1
and an ACL is applied with the following rule:
access-list 101 permit ip any host 90.1.1.1
the route to 90.0.0.0/8 is recursive and 90.1.1.1 is more specific than this route; packets destined to
90.1.1.1 will not get routed to their destination.
This situation will only occur if the route is learned or applied after the ACL is applied to the
interface. If the ACL is applied after the routes are learned, this situation does not occur.
Workaround: Remove and reapply the ACL after a recursive route is learned or applied.
• CSCdr17190
If Resource Reservation Protocol (RSVP) receives Path messages for the same label-switched path
(LSP) session on two different interfaces, RSVP may enter a state where it sends Resv messages
alternately on those interfaces and where only the Resv messages sent on one of the interfaces
contains a label for the LSP.
In the event a single device is receiving the alternating Resv messages, which could happen if the
sending and receiving devices are connected by parallel links, the receiving device will update its
forwarding table entry for the LSP on receipt of each Resv.
Receipt of the Resv with no label will cause the receiving node to install a "label pop" entry.
Packets arriving at the receiving node on the LSP in question will have their top label popped
incorrectly.
Workaround: Shut down the LSP tunnel interface at the LSP head device and wait for the RSVP
state for the LSP to time out of the network.
• CSCdr19089
When deleting a port-channel subinterface on a Cisco 7500/RSP series router that is running
Cisco IOS Release 12.0(10)S, the entire interface (both main and subinterfaces) is deleted rather
than just the selected interface. There is no workaround.
• CSCdr19213
If packet switch ASIC (PSA) access control lists (ACLs) are applied on a Cisco 12000 series gigabit
switch router (GSR), packets that ingress on a PSA-enabled card and egress on a non-PSA card
(Engine 0 or Engine 1) will not appear in the outbound show interface counters even though these
packets are forwarded properly.
This situation only affects the outbound packet accounting (shown by the outbound packet rate
counter) and the outbound packet counter. Input byte and packet rate counters are not effected.
Packets that egress the router on a PSA (Engine 2) card are counted correctly. There is no
workaround.
• CSCdr21181
When Cisco Express Forwarding (CEF) is enabled on a Gigabit Route Processor (GRP) E0
interface on a Cisco 12000 series gigabit switch router (GSR) and the router is reloaded, the ip
route-cache cef interface configuration command is lost after the reload. The default behavior was
changed for this interface as of Cisco IOS Release 12.0(8.6)S by CSCdm01200. This change