Specifications

1281
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S4
Conditions: The symptom is observed in a rare situation when label distribution protocol (LDP) is
used in configurations with a very large number of numbered interfaces. When this problem occurs,
the output of the show process cpu sorted command shows that the “Tagcon Addr” process
consumes the majority of the CPU cycles.
Workaround: There is no workaround.
• CSCef06050
Symptoms: IPv6 unicast and multicast traffic may not recover on an Engine 4 plus (E4+) 1x10 GE
line card after you have performed two software OIRs of the primary CSC.
Conditions: This symptom is observed on a Cisco 12000 series that runs the gsr-p-mz image of
Cisco IOS Release 12.0S.
Workaround: Reload the E4+ 1x10 GE line card.
• CSCef06121
Symptoms: An Engine 2 3-port Gigabit Ethernet line card may stop transmitting packets.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(24)S6.
Workaround: Enter the hw-module reload command to enable the line card to resume transmitting
packets.
• CSCef06858
Symptoms: Line cards in a Cisco 12000 series may fail when an RP switchover occurs.
Conditions: This symptom is observed on a Cisco 12000 series that is configured with two PRPs and
that runs a Cisco IOS interim release for Release 12.0(30)S when you enter the redundancy
force-switchover command. Note, however, that this caveat is resolved in Release 12.0(30)S.
Workaround: There is no workaround.
• CSCef18515
Symptoms: After you have entered the clear cef line command, when you enter the show ip cef
command for the RP and for a line card, the output is inconsistent.
Conditions: This symptom is observed on a Cisco 12000 series that runs a Cisco IOS interim release
for Release 12.0(30)S and that is configured for Fast ReRoute.
Workaround: There is no workaround.
• CSCef22069
Symptoms: On a Cisco 12000 series that functions as an egress PE router in an MPLS VPN network,
after the customer-facing Gigabit Ethernet line card is reloaded, the ingress line card that receives
an incoming VPN label with a destination with a glean adjacency (which requires an ARP) without
a BGP session may not properly complete the adjacency, causing traffic to be dropped.
Conditions: This symptom is mostly observed with static recursive route configurations. To recover
from the symptom, manually ping the interface of the CE router from the adjacent PE router.
Workaround: Configure the static ARP entries for the nexthop router that is configured in the static
recursive routes.
• CSCef25917
Symptoms: A 4GE-SFP-LC line card may reload unexpectedly when it processes QoS traffic in a
configuration with a VLAN on a VCG that is configured with an ingress CoS.