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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(32)S9
Conditions: This symptom is observed only in network topologies with OSPF routes that traverse
two or more sham links. For example, the symptom may occur in a hub-and-spoke topology with
sham links between the hub and two or more individual spokes. This symptom was observed on a
Cisco 10000 series but may also occur on other platforms.
Workaround: There is no workaround.
• CSCsg16778
Symptoms: A router may reload when Border Gateway Protocol (BGP) neighbor statements are
removed from the configuration.
Conditions: This symptom is observed in rare circumstances on a Cisco router when BGP neighbors
are removed very quickly by a script at a much faster rate than manually possible and when a large
BGP table is already present on the router before the script adds and removes the BGP neighbors.
Workaround: There is no workaround.
Further Problem Description: If you manually remove the BGP neighbors, it is less likely that the
symptom occurs.
• CSCsg42488
Symptoms: In an MPLS VPN where OSPF is being used between PE and CE, if the BGP VPNv4
routes received over the VPN backbone are advertised by a Juniper device, OSPF Route-Type and
OSPF Router-ID extended community may not be interpreted correctly. This may result in the PE
redistributing the incorrect route-type via OSPF.
Conditions: - OSPF being used between PE-CE - BGP VPNv4 prefixes received from a Juniper
device
Workaround: If it is possible to configure OSPF Route Type Extended Community/OSPF Router ID
Extended Community type to be advertised by the Juniper device, then using the 0x8000/0x8001
would avoid this problem.
RFC4577 defines two encodings for Route Type and Router ID BGP communities that are used in
VPN context:
OSPF Route Type Extended Community - 0x0306 or 0x8000 OSPF Router ID Extended Community
- 0x0107 or 0x8001
Cisco uses the original encodings (0x8000 and 0x8001) when advertising routes over the VPN
backbone and does not currently recognize the new types (0x0306 and 0x0107).
• CSCsg43140
Symptoms: A router may crash during the boot process and return to ROMmon.
Conditions: This symptom is observed on a Cisco router that is configured for BGP and that has
VPNs configured.
Workaround: There is no workaround.
• CSCsh02161
Symptoms: A Route Reflector (RR) does not withdraw a prefix that redistributes itself even if this
prefix is removed from the BGP table.
Conditions: This symptom is observed on a Cisco router that functions as an RR that advertises two
of the same prefixes with different Route Distinguishers (RDs) when one of these prefixes
redistributes itself and when the other prefix is a route that is learned from an RR client via iBGP.
Workaround: There is no workaround.
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