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Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Caveats
Resolved Caveats—Cisco IOS Release 12.0(31)S3
IP Routing Protocols
CSCec12299
Devices running Cisco IOS versions 12.0S, 12.2, 12.3 or 12.4 and configured for Multiprotocol
Label Switching (MPLS) Virtual Private Networks (VPNs) or VPN Routing and Forwarding Lite
(VRF Lite) and using Border Gateway Protocol (BGP) between Customer Edge (CE) and Provider
Edge (PE) devices may permit information to propagate between VPNs.
Workarounds are available to help mitigate this vulnerability.
This issue is triggered by a logic error when processing extended communities on the PE device.
This issue cannot be deterministically exploited by an attacker.
Cisco has released free software updates that address these vulnerabilities. Workarounds that
mitigate these vulnerabilities are available.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml.
CSCei13040
Symptoms: When an OSPF neighbor comes back up after a very fast (sub-second) interface flap,
OSPF routes that are learned via the interface that flapped may not be re-installed in the RIB.
Conditions: This symptom is observed when the following two events occur:
The interface flaps very quickly.
The neighbor comes back up before the LSA generation timer expires.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the interface that flapped.
Alternate Workaround: Enter the clear ip route * EXEC command.
CSCei75375
Symptoms: OSPFv3 may write zeros into single words of memory in the heap. Depending on what
(if anything) is allocated at the address that is being cleared, the router may reload or fail in some
other way.
Conditions: This symptom is observed only when an OSPFv3 process or area is unconfigured or
when you enter the clear ipv6 ospf process command and when both of the following conditions
are present:
The area that is removed or the process that is cleared contains one or more non-self-originated
type-4 LSAs.
The router does not have an intra-area path to an ASBR that is described by the type-4 LSA.
Workaround: There is no workaround.
CSCsa79783
Symptoms: Routes are lost from the global routing table when Incremental SPF (ISPF) is enabled
and when an OSPF neighbor bounces.
Conditions: This symptom is observed when multiple equal cost paths exist between OSPF
neighbors.
Workaround: To prevent the symptom from occurring, disable ISPF. When the symptom has
occurred, enter the clear ip route * command to re-instate the route.
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