Cisco OL-4015-08 Bedienungsanleitung Seite 417

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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(31)S3
CSCei01644
Symptoms: A 3-port Gigabit Ethernet (3GE-GBIC-SC) line card that is configured for Fast-Path
Multicast Forwarding may reset when receiving specific packets. However, it is not necessary that
the line card will crash all times. The resulting action on these packets could result in a simple drop
as well.
Conditions: This symptom is observed on a Cisco 12000 series when a packet with an IP destination
address from the reserved multicast range (224.0.0.xxx) and a TTL larger than 1 is received on the
3GE-GBIC-SC line card and when multicast hardware acceleration is enabled.
Normally, the TTL should be 1 if the destination address is part of the reserved multicast range.
Workaround: Enter the no hw-module slot slot-number ip multicast hw-accelerate source-table
size 16 offset 0 command.
CSCei24302
Symptoms: When traffic enters an Engine 6 ingress interface and flows in the direction of equal-cost
multiple egress interfaces, all traffic is lost.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(27)S5, Release 12.0(28)S3, or Release 12.0(31)S when the traffic destination is
present in the routing table as a recursive route (for example, learned via iBGP) and when the router
has the IP Source Tracker feature configured. The symptom occurs only when the ingress interface
is an interface of an Engine 6 link card and when multiple equal-cost egress interfaces are used.
Workaround: Enter the clear ip route * command to enable the traffic to reach its destination.
CSCei30764
Symptoms: A PE router that is configured with many (100 or more) Multicast VRFs (mVRFs) may
create multiple MDT tunnels for one mVRF.
Conditions: This symptom is observed when you reload a Cisco router that functions as a PE router
and that is configured for MVPN.
Workaround: There is no workaround.
CSCei33598
Symptoms: A T3 controller of a channelized T3 to DS0 SPA stays down when the remote router
reloads or when the loopback interface is enabled or disabled.
Conditions: This symptom is observed on a Cisco 7600 series and Cisco 12000 series that have
T1 FDL transmission enabled and occurs because unterminated FDL packets exist. The symptom
does not occur when the T1 FDL transmission is disabled.
Workaround: Disable T1 FDL transmission on both ends.
CSCei36672
Symptoms: Interfaces on a 1-port 10-Gigabit Ethernet Engine 5 SPA remain administratively shut
down.
Conditions: This symptom is observed on a Cisco 12000 series after an RPR Plus (RPR+)
switchover has occurred.
Workaround: Prevent an RPR+ switchover from occurring. If this is not an option, there is no
workaround.
CSCei54336
Symptoms: An MPLS LER does not impose labels for traffic that follows the default route, causing
traffic to be forwarded via IP.
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