Chapter 29 port Commands
Management Switch Card User’s Guide
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29.15 IP Bridge Commands
These sections explain how to set up the IP bridge function in the system.
The IP bridge function is designed for large-scale, flat, access networks, and it is ideal when the
network is based on Ethernet. When the IP bridge is enabled, the system forwards frames based on
the destination IP address, instead of the destination MAC address, and it replaces the source MAC
address with its own MAC address.
You can follow these steps to set up a simple IP bridge.
1 Create a domain. (Each domain is an ISP.)
2 Create one or more VLANs in the domain. (For example, one VLAN is for high-speed Internet, and
another VLAN is for VoIP.)
3 Specify one or more edge routers for the domain.
4 Create routing table entries, so the system forwards frames to the appropriate edge router.
5 Create downlink interfaces, so the system forwards frames to the appropriate subscribers.
6 Create PVCs for the subscribers.
29.16 IP Bridge ARP Proxy Commands
Use these commands to look at and flush the Address Resolution Protocol (ARP) table for each
domain. You can also configure how long the system keeps entries in the ARP table.
The system is an ARP proxy for edge routers and subscribers in an IP bridge. You can configure
basic settings for this, and you can look at (and flush, in some cases) the (PVC, MAC, IP, VID)
information the system has learned using DHCP snooping and ARP.
29.16.1 port ipbpvc arpproxy age Command
Syntax:
port ipbpvc arpproxy age <sec>
where
This command configures how long the device stores the IP addresses of CPE devices in IP bridges
in the Address Resolution Protocol table.
<sec>=
The number of seconds (10~10000) the device is to keep the Address Resolution Protocol
table’s entries of IP addresses in IP bridges.
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