ZyXEL Communications IES-1248-51A, User Manual

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Chapter 38 IP Bridge
IES-1248-51V User’s Guide
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1248-51V uses the VLAN ID to identify the domain the downlink interface is in.
Downlink interfaces in the same domain cannot have overlapping IP addresses.
38.1.2.4 Routing Tables
Each domain has its own routing table. Each routing table contains entries that,
based on the destination IP address, control where the IES-1248-51V forwards
packets (for upstream and downstream traffic). The IES-1248-51V automatically
creates routing table entries for each downlink interface and for each edge router
in the domain. You can create additional entries by specifying the edge router to
which the IES-1248-51V should forward traffic for a particular destination IP
address or IP subnet.
38.1.2.5 PVCs
IP bridge PVCs are similar to regular PVCs and are endpoints of the IP bridge. In
addition, IP bridge PVCs are one of two types, IP over Ethernet or IP over ATM,
depending on the underlying network.
The PVID is used to identify the domain the PVC is in, so the PVID must be in a
domain.
38.1.2.6 ARP Proxy Settings
The IES-1248-51V 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 IES-1248-51V has learned
using DHCP snooping and ARP.
38.1.3 IP Bridge Configuration
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
Create the VLAN in the system using the regular screens or commands for VLANs.
4
Specify one or more edge routers for the domain.
5
Create routing table entries, so the IES-1248-51V forwards frames to the
appropriate edge router.
6
Create downlink interfaces, so the IES-1248-51V forwards frames to the
appropriate subscribers.