Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Manual de usuario Pagina 93

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Caveats for Cisco IOS Release 12.2(33)SRD through 12.2(33)SRD8
OL-10394-05 Rev. R0
Conditions: In order to be exposed to this problem, a router must have MPLS TE tunnel interfaces
that are announced to OSPF. Systems that do not run OSPF, or which do not use MPLS-TE are not
affected.
Systems that operate without "service alignment detection" enabled may crash when the following
configuration commands are issued:
Global configuration mode:
* no interface tunnel <n> * no router ospf * no mpls traffic-eng auto-tunnel
Interface configuration mode:
* no ip unnumbered * no ip address
Exec mode:
* clear mpls traffic-eng auto-tunnel
Note that routers running modular IOS (ION) and IOS-XE do not have alignment detection enabled.
Regardless of the state of alignment detection, removing the last MPLS-TE tunnel interface to a
destination can cause problems, as can removing auto-tunnel configuration. Removal of
dynamically created auto-tunnel interfaces as a result of changes in the network topology has the
same effect.
Note that routers using auto backup tunnels to provide fast reroute for static MPLS-TE tunnels do
not have any extra exposure to this bug because while these backup tunnels may be removed due to
topology changes, the static tunnel to the same destination will not be.
Normal UP/DOWN state changes of tunnel interfaces do not cause problems.
Workaround: To remove a MPLS-TE tunnel interface, first configure it down with the "shutdown"
command in interface submode.
To remove an OSPF instance, first disable MPLS-TE for the instance by configuring "no mpls
traffic-eng area <n>" in router ospf submode.
No workaround is available for MPLS-TE auto-tunnels.
CSCsw25200
Symptoms: When flapping a fiber, the link protocol comes up, but the line protocol does not.
Conditions: Occurs on links between SIP modules.
Workaround: Perform a shut/no shut on the interface.
CSCsw39190
Symptoms: Both active and standby supervisors crash.
Conditions: Occurs when Control Plane Policing (COPP) is configured and there are multiple
session churns happening with PPPoE subscribers.
Workaround: There is no workaround.
CSCsw48359
Symptoms: With traffic flowing normally over a GRE tunnel terminating on the ES20 line card the
module will crash when IPSec tunnel protection is enabled.<BR><BR>
Conditions: Occurs when tunnel endpoint is an interface on the ES20 line card.<BR><BR>
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