Avaya a500 Mode D'Emploi
Cajun A500 ATM Switch Overview
Cajun A500 ATM Switch User Guide
1-7
Internal Static IP Connectivity
The Cajun A500 supports internal static IP connectivity. This functionality enables you to
manage the switches when there is no ethernet or LANE services available. You
configure one switch as the designated A500 or static IP server and all other switches in
the topology are configured as static IP client. The static IP server keeps a table that maps
the ATM addresses of the static IP clients to their respective IP addresses.
The static IP server also creates Inband connections to each of the static IP clients. In this
way, ethernet connectivity is required only to the designated A500/static IP server. The
static IP server acts as a proxy for the static IP clients and bridges across the ethernet to
the Inband ATM connections to the static IP clients. The result is that you only need an
out-of-band connection to the static IP server and from this connection can access (via
telnet, web, SNMP etc.) all of the other switches via the Inband connections.
Note: Hijacking the Ethernet Port: static IP is used to create IP connection (e.g.,
Telnet, SNMP) to A500 switches when LANE is not available. When LANE is
available, LANE is the preferred method to provide IP connection.
On the static IP server, the Network Management System (NMS) is on the ether
port; there is no instance of an ethernet interface and user defines the static IP
address for the box (Managed Entity).
On the static IP Client, there can exist an instance of the ethernet interface,
where the ethernet must be on a subnet other than the NMS subnet. When
static IP is in use, the NMS should be on the same network as the ME, e.g.,
A500. If this is not the case, the default gateway must be on the same network
as the Static IP address. This applies to both the client and server A500s. This
forces the IP traffic to flow on the static IP Interface.
Note: Ethernet Filtering in Promiscuous Mode: To provide static IP, the ethernet
interface (physical port) must be placed in promiscuous mode. This mode
enables the static IP server to receive unicast MAC frames destined for
Static-IP Clients. To avoid overwhelming the A500 with ethernet traffic, a
filter has been defined to only accept those frames with an OUI matching that
of the static IP server. If the OUI ever changes on a A500 you add later, that
A500 will not transmit data.
This functionality supports in-band communication from an ethernet attached
management station on one Cajun A500 to the other Cajun A500s in the network. This
capability is only available when LANE in not available in the network. Figure 1-3
depicts the typical situation where this functionality is available.