
Chapter 38 IP Bridge
IES-1248-51V User’s Guide
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This is illustrated in the following example.
Figure 129 IP Bridge: Upstream Traffic Example
Notice that the IES-1248-51V does not change the IP packet header.
The process is reversed but otherwise similar for downstream traffic. The IES-
1248-51V learns how to forward frames to the appropriate subscriber from one of
the following sources.
• DHCP snooping. The IP-aware IES-1248-51V snoops DHCP packets, so it knows
what IP addresses have been assigned to subscribers.
• ARP. The IES-1248-51V 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.
38.1.2 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
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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