Specifications

1139
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S2
The symptom occurs when the VRF ingress interface is configured on an Engine 2 3-port GE line
card or Engine 2 1-port OC-48 POS line card. Other line cards may be affected too. The symptom
does not occur when the VRF ingress interface is configured on an Engine 0 4-port OC-3 POS line
card or 4-port GE ISE line card.
Workaround: There is no workaround.
• CSCef91170
Symptoms: A Cisco 12000 series that has a CHOC12/DS1 ISE line card that is configured for mVPN
over multilink PPP may not maintain PIM neighbors over GRE tunnels.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(27)S2, 12.0(27)S3, or 12.0(28)S1.
Workaround: On the multilink interface, enter the following sequence of commands:
Router(config)# interface multi1
Router(config-if)# no ip pim sparse-dense-mode
Router(config-if)# ip pim sparse-dense-mode
Doing so enables the PIM neighbor to come up across the GRE tunnel.
• CSCef91475
Symptoms: A CPUHOG situation may occur intermittently on a Cisco 12000 series, causing fabric
pings to be lost and all OSPF and BGP adjacencies to be dropped.
Conditions: This symptom is observed in PRP on a Cisco 12000 series router.
Workaround: There is no workaround. However, the symptom resolves itself.
• CSCef92153
Symptoms: When a VRF VLAN subinterface punts a packet such as an ARP or ICMP packet to the
CPU of the line card, the main interface is unable to process a packet such as ICMP packet that is
destined for the main interface. When BGP packets enter and leave via the main interface, a BGP
neighbor may go down.
These symptoms do not affect non-VRF subinterfaces, only the main interface. Transit packets that
pass through the main interface are not affected.
When a non-VRF VLAN subinterface punts a packet to the CPU of the line card, the main interface
may return to normal operational.
Conditions: These symptoms are observed on an Engine 4+ Gigabit Ethernet line card that is
installed in a Cisco 12000 series that runs Cisco IOS Release 12.0 (25)S. Engine 2 and Engine 3 line
cards are not affected. For the symptoms to occur, all of the following conditions must be present:
– A VRF VLAN subinterface is configured on the Engine 4+ line card.
– The main interface is also used with an IP address assigned to it.
– The VRF VLAN subinterface receives a packet such as an ARP or ICMP packet that is punted
to the CPU of the line card.
For the BGP neighbor to go down, in addition to the above-mentioned conditions, the neighbor
ip-address password string command must be configured.
Workaround: If you must use a VRF VLAN subinterface, create another subinterface for non-VRF
communication on the same main interface.
Alternate Workaround: Do not use a VRF VLAN subinterface.