Enterasys Networks CSX7000 Manual do Utilizador descarregar pdf (Página 151)

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101

Central Site Remote Access Switch 151

ONFIGURING

ASIC

IP R

OUTING

IP Network Interfaces

with a remote device on a different subnet, the local device will ARP for the remote host’s MAC

address.

Since routers do not forward ARP requests across subnets, ARPs sent for hosts which are not

on the same physical network segment will go unanswered. The proxy ARP feature will

potentially generate an ARP reply for remote hosts. If the CyberSWITCH determines that it

provides the best route to the remote device, it will respond with an ARP reply containing the

MAC address of the CyberSWITCH. Further communication between the two hosts will then

be routed through the CyberSWITCH.

• Secondary IP Addressing

If only one IP network interface (i.e., one subnet) per LAN port is configured, any traffic from

hosts on different subnets attached to the LAN port would be dropped.

With the secondary IP addressing feature, multiple IP network interfaces may be configured

for each LAN port. All existing subnets which are to be reached will have an associated IP

network interface on the CyberSWITCH. By allowing each LAN port to be configured with

multiple IP network interfaces, the CyberSWITCH can route packets from hosts on any of the

subnets attached to the LAN port. (See following example.)

Example: IP Host Communications in Flattened Networks

To communicate with destination hosts which are not on the same physical wire, you must have a

router attached to the edge of the flattened network which can forward packets to those destination

networks. In the following illustration, we are using a CyberSWITCH as our “edge” router:

ISDN

CSX5500

1.1.1.1

2.2.2.1

Host A

Host B

1.1.1.22.2.2.2

Host D

Host C

3.3.3.3

1.1.1.3

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