User guide

Open Problem Reports and Feature Exceptions
page 92 OmniSwitch 6600/7000/8800—Release 5.1.5.R04
PR 74581
Some releases of Cisco's PIM implementation default to "full packet" checksums for their register packet
checksum algorithm. This causes Cisco routers to reject valid PIM register packets from the OS7000 PIM
implementation which defaults to "header only" checksums for PIM register packets.
Workaround: Change “register checksum” to “full” when connecting Cisco PIM-SM router to the
OS7000.
PR 74719
If a Cisco router is configured as a C-BSR with the highest priority and it is not directly connected to the
OS7000s, the OS7000s will not see the Cisco router as the BSR.
Workaround: Configure the OS7000 to be the BSR instead of the Cisco router if the Cisco router is not
directly connected to the OS7000.
PR 74815
On the OS7000, the hashing function, which calculates the hash value used to map a group to an RP, has
problems when running with a Cisco router. It appears that the Cisco box is forgetting the last part of the
formula (mod 2^31) which masks off the upper bit.
Workaround: When running PIM-SM with a Cisco router, do not use multiple RPs with the same prior-
ity.
PR 74881
When a Cisco router is acting as the DR (Designated Router) with spt-switchover enabled, the Cisco router
may erroneously send (S,G) prunes to the OmniSwitch 7700/7800’s causing the multicast streams to be
disrupted. This seems to be the case when the route to the RP is the same as the route to the source.
Workaround: Disable spt-switchover on the Cisco.
PR 74979
On the OS7000, the console may scroll the following messages to report that there is something miscon-
figured or software/hardware is behaving improperly in the lower layers:
tPimsm: Received Hello from my own IP: xx.xx.xx.xx. Invalid configuration
tDvmrp: dvmrpRecvProbe: Configuration/Lower-layer problem V<vlan> Looping back our Probes
tDvmrp: dvmrpRecvReport: Configuration/Lower-layer problem V<vlan> Looping back our own RRs
Workaround: If you don't want these messages to scroll on the console, the following commands will
stop them: ip pimsm debug-level 0 or ip dvmrp debug-level 0 .