Chapter 3: Bridging Configuration Guide
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SmartSwitch Router User Reference Manual
For example, if port 1 belongs to VLAN
IPX_VLAN
for IPX, VLAN
IP_VLAN
for IP and
VLAN
OTHER_VLAN
for any other protocol, then an IP frame received by port 1 is
classified as belonging to VLAN
IP_VLAN
.
Trunk ports (802.1Q) are usually used to connect one VLAN-aware switch to another.
They carry traffic belonging to several VLANs. For example, suppose that SSR A and B
are both configured with VLANs V1 and V2.
Then a frame arriving at a port on SSR A must be sent to SSR B, if the frame belongs to
VLAN V1 or to VLAN V2. Thus the ports on SSR A and B which connect the two SSRs
together must belong to both VLAN V1 and VLAN V2. Also, when these ports receive a
frame, they must be able to determine whether the frame belongs to V1 or to V2. This is
accomplished by “tagging” the frames, i.e., by prepending information to the frame in
order to identify the VLAN to which the frame belongs. In the SSR switching routers,
trunk ports always transmit and receive tagged frames only. The format of the tag is
specified by the IEEE 802.1Q standard. The only exception to this is Spanning Tree
Protocol frames, which are transmitted as untagged frames.
Explicit and Implicit VLANs
As mentioned earlier, VLANs can either be created explicitly by the administrator (explicit
VLANs) or are created implicitly by the SSR when L3 interfaces are created (implicit
VLANs).
Configuring SSR Bridging Functions
Configuring Address-based or Flow-based Bridging
The SSR ports perform address-based bridging by default but can be configured to
perform flow-based bridging instead of address-based bridging, on a per-port basis. A
port cannot be configured to perform both types of bridging at the same time.
The SSR performance is equivalent when performing flow-based bridging or address-
based bridging. However, address-based bridging is more efficient because it requires
fewer table entries while flow-based bridging provides tighter management and control
over bridged traffic.
For example, the following illustration shows an SSR with traffic being sent from port A to
port B, port B to port A, port B to port C, and port A to port C.
Содержание SmartSwitch Router
Страница 1: ...SmartSwitch Router User Reference Manual 9032578 04...
Страница 12: ...Notice 12 SmartSwitch Router User Reference Manual...
Страница 28: ...Preface 28 SmartSwitch Router User Reference Manual...
Страница 68: ...Chapter 3 Bridging Configuration Guide 68 SmartSwitch Router User Reference Manual...
Страница 74: ...Chapter 4 SmartTRUNK Configuration Guide 74 SmartSwitch Router User Reference Manual...
Страница 84: ...Chapter 5 DHCP Configuration Guide 84 SmartSwitch Router User Reference Manual...
Страница 108: ...Chapter 7 VRRP Configuration Guide 108 SmartSwitch Router User Reference Manual...
Страница 207: ...SmartSwitch Router User Reference Manual 207 Chapter 12 Multicast Routing Configuration Guide...
Страница 208: ...Chapter 12 Multicast Routing Configuration Guide 208 SmartSwitch Router User Reference Manual...
Страница 222: ...Chapter 13 IP Policy Based Forwarding Configuration Guide 222 SmartSwitch Router User Reference Manual...
Страница 232: ...Chapter 14 Network Address Translation Configuration Guide 232 SmartSwitch Router User Reference Manual...
Страница 254: ...Chapter 16 IPX Routing Configuration Guide 254 SmartSwitch Router User Reference Manual...
Страница 270: ...Chapter 17 Access Control List Configuration Guide 270 SmartSwitch Router User Reference Manual...
Страница 282: ...Chapter 18 Security Configuration Guide 282 SmartSwitch Router User Reference Manual...
Страница 294: ...Chapter 19 QoS Configuration Guide 294 SmartSwitch Router User Reference Manual...
Страница 298: ...Chapter 20 Performance Monitoring Guide 298 SmartSwitch Router User Reference Manual...
Страница 338: ...Chapter 22 WAN Configuration Guide 338 SmartSwitch Router User Reference Manual...