Zyxel IES-1248 EE [261/544] Ip bridge settings

Zyxel IES-1248 EE [261/544] Ip bridge settings
Chapter 39 IP Bridge
IES-1248-51/51A/53 User’s Guide
261
Figure 132 IP Bridge: Upstream Traffic Example
Notice that the IES-1248 does not change the IP packet header.
The process is reversed but otherwise similar for downstream traffic. The IES-1248 learns
how to forward frames to the appropriate subscriber from one of the following sources.
DHCP snooping. The IP-aware IES-1248 snoops DHCP packets, so it knows what IP
addresses have been assigned to subscribers.
ARP. The IES-1248 uses ARP to find out which subscriber has a particular IP address.
Static information. You should provide forwarding information manually for subscribers
that have static IP addresses and do not respond to ARP queries.
39.1.2 IP Bridge Settings
The IP bridge function consists of the following settings.
Domains and VLANs
Edge routers
Downlink interfaces
Routing tables
•PVCs
ARP proxy settings
Each set of settings is discussed in more detail in the following sections.
39.1.2.1 Domains and VLAN
A domain represents an ISP. Each domain is defined by (and dominates) the VLAN that are in
it and has its own routing table and ARP table. As a result, two or more VLANs in different
domains can use the same IP subnet, and one network can support multiple ISPs.
MAC g
MAC x
MAC a
Source IP: 192.168.1.1
Source MAC: x
Destination IP: 192.168.10.5
Destination MAC: g
VLAN: 200
Source IP: 192.168.1.1
Source MAC: a
Destination IP: 192.168.10.5
Destination MAC: x
VLAN: 100
IP 192.168.10.5
IP: 192.168.1.1
VLAN: 100
VLAN: 200

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