Specifications

1403
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S
• CSCec63271
Symptoms: Some channelized PA-MC-2T3+ interfaces on a Cisco 7500 series router may go into a
down/down state. When this symptom occurs, one or more groups of four T1 interfaces may go
down simultaneously because of an Rx Alarm Indication Signal (AIS) alarm, and all of the
interfaces associated with the down/down T1 interfaces may also go into the down/down state.
Conditions: This symptom is observed only on a PA-MC-2T3+ port adapter. This symptom may be
caused by a router or Versatile Interface Processor (VIP) reload or a circuit failure on the T3 port
adapter. This symptom has not been observed on the PA-MC-T3 port adapter.
Workaround: Perform an online insertion and removal (OIR) of the VIP that seats the PA-MC-2T3+.
Make sure that you follow the guidelines for performing an OIR procedure on a Cisco 7500 series
router.
Alternate Workaround: Identify the router with four ports in the down/down state, and reload this
router. You can identify the router with the interfaces in the down/down state by checking for the
presence of AIS on all four ports. T1 interfaces will go down in the following combinations: 1-4,
5-8, 9-12, 13-16, 17-20, and 21-24. If T1 interfaces go down in 3-6 or 10-13 combinations, this
symptom is not the reason that the interfaces are in the down/down state.
• CSCec63382
Symptoms: When an Ethernet over Multiprotocol Label Switching (EoMPLS) virtual circuit (VC)
is configured on a 3-port Gigabit Ethernet (GE) line card, the EoMPLS VC status may be in the “up”
state, but no traffic passes through the EoMPLS VC.
Conditions: This symptom is observed under rare conditions when there is some network instability
(for example, when the core interface flaps).
Workaround: One of the following workarounds may be used:
– Enter the shutdown interface configuration command followed by the no shutdown interface
configuration command on the edge-facing interface that performs EoMPLS imposition.
– Enter the shutdown interface configuration command followed by the no shutdown interface
configuration command on the core-facing interface. To identify the core-facing interface,
review the output of the show mpls l2transport vc detail EXEC command. It will display the
output interface (the core-facing interface) that is being used on a per-VC basis.
– Reload the 3-port GE line card.
• CSCec63743
Symptoms: Virtual circuits (VCs) go down when a policy map is attached. The policy map includes
an input policy map (for example, created by entering the set mpls experimental imposition QoS
policy-map class configuration command) and an output policy map (for example, created by
entering the queue-limit policy-map class configuration command).
Conditions: This symptom is observed on a Cisco router with an Engine 2 (E2) 8xOC3 ATM line
card and an Engine 3 (E3) 4xOC12 ATM line card.
Workaround: Reload the router.
• CSCec64570
Symptoms: The node of a local Label Switch Controller (LSC) that is part of a Multiprotocol Label
Switching (MPLS) cell-based network may observe the following symptoms:
– The local provider edge (PE) router cannot ping the remote customer edge (CE) router.
– The remote PE router cannot ping the local CE router.
– The local PE router can ping the remote CE router with type of service (Tos) equal to 0xe0.