Unknown Destination
page -40 OmniSwitch Troubleshooting Guide September 2005
5
Classify Special DA
DA is router MAC DA is IGMP DA is IPMS DA is STP multicast
(BPDU)
6 7
8
DA PCAM
lookup,
known ?
S/W Slow Path Routing L3
FDB?
Sendto Destination
Send to Default
Gateway
N N
Y
Y
Provides a
N
ext_Hop_Header_Cache index
N
HHC index provides QID,
ReQID & PDI
Performs NAT, MAC-DA, TTL,
SLB and Fragment modifications
4
L3 Packet Walk
6
DA is IGMP
S/W
QID set
to either
multicast
within
the vlan
or dro
p
ReQID
Sent to
S/W for
p
rocessing
7
DA is IPMS
L3 DA lookup
Pass?
N
ew IPMS
group
S/W
L3-DA, L3-SA,
pport, sGID
lookup, Pass ?
Flow not
known
S/W
Set QID, ReQID, PDI &
header_cache info Access PDI
En Queue the
data to the
final
QID=511
(multicast
Queue on
N
antucket)
N
antucket sends thepacket to al l egress
Coronado within the same
multicast/vlan id
Egress Coronado sends to all the ports in the
same vlan, strips tag if necessary
N
N
Y
Y
IGMP/IPMS