Alcatel Carrier Internetworking Solutions 8800 User Manual
Unknown Destination
OmniSwitch Troubleshooting Guide
September 2005
page -39
Packet arrives from Catalina to Coronado
Source Address
known ?
known ?
Y
1
Pseudo-CAM (PCAM)
Provides Group ID
(GID)
Provides Group ID
(GID)
N
2
Assign
Default GID
and sends to
S/W
Default GID
and sends to
S/W
De Queue packet and
perform PCAM update
perform PCAM update
Is DA
Special ?
Special ?
Is DA Router MAC,
IGMP, STP, Multicast
Switching
IGMP, STP, Multicast
Switching
Y
5
N
Is DA
Known?
Known?
Lookup provides QID
& Priority Description
Index (PDI)
& Priority Description
Index (PDI)
Y
4
Access PDI to assign
internal priority (0…3)
& final QID
internal priority (0…3)
& final QID
En Queue data to
final QID, QID
determines
destination port,
priority &
bandwidth
final QID, QID
determines
destination port,
priority &
bandwidth
Queue Manager selects
packet for transmission
to Nantucket, if needed
packet for transmission
to Nantucket, if needed
Nantucket send to other
Coronado, if needed.
Coronado, if needed.
Egress Coronado forwards the
packet to destination port,
strips Q-tag, if needed.
packet to destination port,
strips Q-tag, if needed.
Known/Unknown SA and Known DA
N
A
A
DA QID is unknown, QID is set to flood,
PDI is set to unknown DA and ReQID is set
for s/w for unknown DA
PDI is set to unknown DA and ReQID is set
for s/w for unknown DA
S/W De Queue s packet. Includes the learning
of MAC DA via request to all other Coronados
of MAC DA via request to all other Coronados
Egress logic sends copy of the packet to all
the ports in that vlan. Strips Q-tag if needed
the ports in that vlan. Strips Q-tag if needed
.
Get final QID
4
Unknown DA