SWITCHING
Bridging
To learn MAC addresses, a switch reads all packets that it detects on the LAN or on the
local VLAN, looking for MAC addresses of sending nodes. It places these addresses into its
Ethernet Switching table, along with the interface on which the traffic was received and the
time when the address was learned. When the switch receives traffic on an interface, it
searches the Ethernet switching table for the MAC address of the destination. If the MAC
address is not found, the traffic is flooded out all of the other interfaces associated with the
VLAN. If traffic is received on an interface that is associated with VLAN 1 and there is no
entry in the Ethernet switching table for VLAN 1, then the traffic is flooded to all access and
trunk interfaces that are members of VLAN 1.
Flooding allows the switch to learn about destinations that are not yet in its Ethernet
switching table. If a certain destination MAC address is not in the Ethernet switching table,
the switch floods the traffic to all interfaces except the interface on which it was received.
When the destination node receives the flooded traffic, it sends an acknowledgment packet
back to the switch, allowing the switch to learn the MAC address of the node and to add the
address to its Ethernet switching table.
The switch uses a process called aging to keep the Ethernet switching table current. For
each MAC address in the Ethernet switching table, the switch records a timestamp of when
the information about the network node was learned. Each time the switch detects traffic
from a MAC address that is in its Ethernet switching table, it updates the timestamp of that
MAC address. A timer on the switch periodically checks the timestamp, and if it is older than
the value set for
mac-table-aging-time
, the switch removes the node's MAC address from
the Ethernet switching table. This aging process ensures that the switch tracks only active
MAC addresses on the network and that it is able to flush out from the Ethernet switching
table MAC addresses that are no longer available.
The user can configure:
How long MAC addresses remain in the Ethernet switching table
Add a MAC address permanently to the switching table
Prevent a MAC address from ever being registered in the switching table.
To navigate to the
Bridging
page:
1. Click on the
+
next to
Switching
.
59
EX24000 Switch Users Guide
Содержание EX24000
Страница 32: ...Figure 8 IP Address 32 EX24000 Switch Users Guide ...
Страница 42: ...Figure 14 Remote Logging Page 42 EX24000 Switch Users Guide ...
Страница 53: ...Figure 22 Port Security 53 EX24000 Switch Users Guide ...
Страница 61: ...Figure 23 Bridging 61 EX24000 Switch Users Guide ...
Страница 67: ...Figure 26 Storm Detect 67 EX24000 Switch Users Guide ...
Страница 72: ...Figure 31 Port Mirroring 72 EX24000 Switch Users Guide ...
Страница 88: ...Figure 38 LACP Trunking 88 EX24000 Switch Users Guide ...
Страница 93: ...Figure 39 STP Ring Global Configuration 93 EX24000 Switch Users Guide ...
Страница 97: ...Figure 42 Max Age Hello Timer Forward Delay 97 EX24000 Switch Users Guide ...
Страница 116: ...Figure 55 Port Cost Priority 116 EX24000 Switch Users Guide ...
Страница 118: ...Figure 56 Port Instance Configuration Figure 57 Port Instance Adding Ports 118 EX24000 Switch Users Guide ...
Страница 132: ...Figure 63 Advanced Per Port Configuration 132 EX24000 Switch Users Guide ...
Страница 163: ...Figure 78 SNMP General Settings 163 EX24000 Switch Users Guide ...
Страница 181: ...Figure 91 LLDP Global Settings 181 EX24000 Switch Users Guide ...
Страница 183: ...Figure 92 LLDP Ports Settings 183 EX24000 Switch Users Guide ...
Страница 193: ...Figure 95 GVRP 193 EX24000 Switch Users Guide ...
Страница 198: ...Figure 98 GVRP Per Port Settings 198 EX24000 Switch Users Guide ...
Страница 223: ...Figure 110 Daylight Savings Date Mode 223 EX24000 Switch Users Guide ...