[c-nsp] 6506-E with Sup-720-3BXL jumps to 99% CPU with only 1 full BGP session

[Jose Madrid]

I have a 6506-E with nothing going on except for a full BGP session
with a provider.  We did it this way to test out some stuff, but have
been hitting 99% CPU with just this one session turned on.  Any ideas?
I have included some relevant output from the device.  The 3 processes
eating up the CPU are IP RIB update, BGP Router, XDR Mcast.  I have
already spoken to Cisco and they were only mildly helpful.

#sh module
Mod Ports Card Type                              Model              Serial No.
--- ----- -------------------------------------- ------------------ -----------
  2    4  CEF720 4 port 10-Gigabit Ethernet      WS-X6704-10GE
  3    4  CEF720 4 port 10-Gigabit Ethernet      WS-X6704-10GE
  4   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX
  5    2  Supervisor Engine 720 (Active)         WS-SUP720-3BXL

Mod MAC addresses                       Hw    Fw           Sw           Status
--- ---------------------------------- ------ ------------ ------------ -------
  2  0017.5936.afec to 0017.5936.afef   2.2   12.2(14r)S5  12.2(33)SXI7 Ok
  3  0018.19ee.4b22 to 0018.19ee.4b25   2.2   12.2(14r)S5  12.2(33)SXI7 Ok
  4  0017.9599.ae8c to 0017.9599.aebb   2.3   12.2(18r)S1  12.2(33)SXI7 Ok
  5  0012.dae4.5c84 to 0012.dae4.5c87   4.6   8.5(4)       12.2(33)SXI7 Ok

Mod  Sub-Module                  Model              Serial       Hw     Status
---- --------------------------- ------------------ ----------- ------- -------
  2  Centralized Forwarding Card WS-F6700-CFC
  3  Centralized Forwarding Card WS-F6700-CFC
  4  Centralized Forwarding Card WS-F6700-CFC
  5  Policy Feature Card 3       WS-F6K-PFC3BXL
  5  MSFC3 Daughterboard         WS-SUP720


#show platform hardware pfc mode
PFC operating mode : PFC3BXL



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