Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Manual de usuario Pagina 238

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684
Caveats for Cisco IOS Release 12.2(33)SRD through 12.2(33)SRD8
OL-10394-05 Rev. R0
Symptoms: Under stress conditions, an L2TP multihop node may crash.
Conditions: This symptom is observed when a session is being disconnected.
Workaround: There is no workaround.
CSCsb15582
Symptoms: A PVC is unexpectedly removed from an IMA interface when one or more IMA links
go down. This results in packet loss.
Conditions: This symptom is observed on a Cisco router that has an ATM IMA interface that is
configured with ATM dynamic bandwidth and no ATM oversubscription when you shut down one
of the IMA links, causing dynamic bandwidth allocation to occur on the PVCs.
Workaround: Reconfigure the PVCs with a bandwidth that can be supplied by the remaining IMA
links.
CSCsb36463
Symptoms: IGMP packets are rate limited when they arrive on a layer 3 port (routed port) and are
sent to the route processor.
Conditions: The IGMP packets can be rate-limited if (1) IP-option rate limiter is configured using
the mls rate-limit multicast ip-options pps packets-in- burst command, and IGMP packets contain
router alert option. (2) FIB miss rate limiter is configured using the mls rate-limit multicast ipv4
fib-miss pps packets-in- burst command.
Workaround: Configure ports as switchports with an SVI instead of a routed port or increase rate
limiter parameters to allow expected level of IGMP packets.
CSCsc75381
Symptoms: Native VLAN mismatch may not be detected when native VLAN is not consistent on
two ends of 802.1Q trunk and native VLAN is not allowed on one end only. This is a case of
misconfiguration, but it may result in a forwarding loop.
For example:
switch1(native=3)---802.1Q_trunk---(native=2)switch2
allowed vlans on switch1: 3,4 allowed vlans on switch2: 3,4
If STP designated port is on the switch1 side, this misconfiguration may not be detected.
Conditions: This symptom occurs when misconfiguration is not detected.
Workaround: Correct misconfiguration. Make native VLAN consistent on both sides or at least
allow VLAN 2 (native) on trunk on switch2.
CSCsc77148
Symptoms: Device may crash when the show ipx cache command is entered.
Conditions: The show ipx cache command displays IPX cache entries. If there are a lot of entries,
it will display few entries first and the remaining entries can be viewed by pressing space bar. If an
entry is freed during this time (before we hit the space bar to view that entry), then it leads to
accessing freed memory and hence crash.
Workaround: There is no workaround.
CSCsc87117
Symptoms: Bidirectional designated forwarder flaps, and packets are looped in the network for up
to 20 seconds.
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