Alcatel Carrier Internetworking Solutions 6800 User Manual
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)
(BPDU)
6
7
8
DA PCAM
lookup,
known ?
lookup,
known ?
S/W
Slow Path Routing
L3
FDB?
FDB?
Send to Destination
Send to Default
Gateway
Gateway
N
N
Y
Y
Provides a
Next_Hop_Header_Cache index
Next_Hop_Header_Cache index
NHHC index provides QID,
ReQID & PDI
ReQID & PDI
Performs NAT, MAC-DA, TTL,
SLB and Fragment modifications
SLB and Fragment modifications
4
L3 Packet Walk
6
DA is IGMP
S/W
QID set
to either
multicast
within
the vlan
or drop
to either
multicast
within
the vlan
or drop
ReQID
Sent to
S/W for
processing
Sent to
S/W for
processing
7
DA is IPMS
L3 DA lookup
Pass?
Pass?
New IPMS
group
group
S/W
L3-DA, L3-SA,
pport, sGID
lookup, Pass ?
pport, sGID
lookup, Pass ?
Flow not
known
known
S/W
Set QID, ReQID, PDI &
header_cache info
header_cache info
Access PDI
En Queue the
data to the
final
QID=511
(multicast
Queue on
Nantucket)
data to the
final
QID=511
(multicast
Queue on
Nantucket)
Nantucket sends the packet to all egress
Coronado within the same
multicast/vlan id
Coronado within the same
multicast/vlan id
Egress Coronado sends to all the ports in the
same vlan, strips tag if necessary
same vlan, strips tag if necessary
N
N
Y
Y
IGMP/IPMS