ZyXEL ZyWALL USG 2000 User Guide - Page 319
Bridge Interface Overview
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Chapter 13 Interfaces If computer B responds to computer A, bridge X records the source address 0B:0B:0B:0B:0B:0B and port 4 in the table. It also looks up 0A:0A:0A:0A:0A:0A in the table and sends the packet to port 2 accordingly. Table 69 Example: Bridge Table After Computer B Responds to Computer A MAC ADDRESS PORT 0A:0A:0A:0A:0A:0A 2 0B:0B:0B:0B:0B:0B 4 Bridge Interface Overview A bridge interface creates a software bridge between the members of the bridge interface. It also becomes the ZyWALL's interface for the resulting network. Unlike the device-wide bridge mode in ZyNOS-based ZyWALLs, this ZyWALL can bridge traffic between some interfaces while it routes traffic for other interfaces. The bridge interfaces also support more functions, like interface bandwidth parameters, DHCP settings, and connectivity check. To use the whole ZyWALL as a transparent bridge, add all of the ZyWALL's interfaces to a bridge interface. A bridge interface may consist of the following members: • Zero or one VLAN interfaces (and any associated virtual VLAN interfaces) • Any number of Ethernet interfaces (and any associated virtual Ethernet interfaces) When you create a bridge interface, the ZyWALL removes the members' entries from the routing table and adds the bridge interface's entries to the routing table. For example, this table shows the routing table before and after you create bridge interface br0 (250.250.250.0/23) between ge1 and vlan1. Table 70 Example: Routing Table Before and After Bridge Interface br0 Is Created IP ADDRESS(ES) DESTINATION IP ADDRESS(ES) DESTINATION 210.210.210.0/24 ge1 221.221.221.0/24 vlan0 210.211.1.0/24 ge1:1 230.230.230.192/26 ge3 221.221.221.0/24 vlan0 241.241.241.241/32 ge4 222.222.222.0/24 vlan1 242.242.242.242/32 ge5 230.230.230.192/26 ge3 250.250.250.0/23 br0 241.241.241.241/32 ge4 242.242.242.242/32 ge5 In this example, virtual Ethernet interface ge1:1 is also removed from the routing table when ge1 is added to br0. Virtual interfaces are automatically added to or remove from a bridge interface when the underlying interface is added or removed. ZyWALL USG 2000 User's Guide 319
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