
Glossary
Each of these steps is described in more detail in the following sections.
Quality of Service is described separately in section 5.5 on page 39.
5.2
Ingress Port Switching
The steps in ingress port switching are illustrated in Figure 15 on page 29.
Figure 15
Detailed Path from Ingress Port to Switching Domain
When a frame arrives at the ingress port, the following actions are taken:
Arriving frame
FCS
error?
Discard
Null DA,
PAUSE etc.?
Discard
Bridge and
STP port state?
Depending
on port state:
internal
processing
Connection to
vlan exists?
Discard
Filtering?
(optional)
To host port,
ethernet link
port or
switching
domain
Discard
Introductory
’classification’
and checks
Layer 1
Change
DA
No
connection
Discard
BPDU?
Ingress
switching
ARP, DHCP, IGMP?
Filtering
Depending on
configuration
internal
processing
broadcast
/
multicast/unicast,
untagged/
tagged/
double tagged
Quality of Service
To switching domain
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