Virtual Lan (Vlan) Routing; Route Redistribution; Route Preferences - Fujitsu Siemens Computers PRIMERGY BX Description

Features of the Switch
PRIMERGY BX600 router discovery, a router periodically multicasts a Router
Advertisement from each of its multicast interfaces, announcing the IP address(es) of that
interface. Hosts discover the addresses of their neighboring routers simply by listening for
advertisements. Since a host knows the address of its neighbors, the host can send IP data
grams beyond its directly attached subnet.

Virtual LAN (VLAN) Routing

PRIMERGY BX600 incorporates both 802.1Q VLAN bridging and routing functions. The
internal bridging function can be an interface to the routing function and the routing function
can be an interface to the bridging function will support. Even though PRIMERGY BX600
supports both 802.1Q VLAN bridging and routing functions, each port cannot operate as both a
router port and an 802.1Q bridge port.
When a port is enabled for bridging (the default) rather than routing, all normal bridge
processing is performed for an inbound packet associated with a VLAN. Its MAC Destination
Address (DA) and VLAN ID are used to search the MAC address table and the packet was
forwarded depend on MAC table. If routing is enabled for the VLAN and the MAC DA of an
inbound unicast packet is that of the internal bridge-router interface, the packet will be routed.
An inbound multicast packet will be forwarded to all ports in the VLAN, plus the internal
bridge-router interface if it was received on a routed VLAN.

Route Redistribution

Route Redistribution allows routers running different routing protocols to exchange routing
information on the network. A route redistribution implementation must consider that different
routing protocols use different ways of expressing the distance to a destination. Also routing
metrics in different protocols may have different formats and allow a different range of values.
For example,
the RIP route metric is a single integer from 1 to 16.
the OSPF route metric is a 24 bit integer.
PRIMERGY BX600 implementation of route redistribution has the following configuration
characteristics:
- For each routing protocol (OSPF, RIP), the administrator may specify which routes are
redistributed (OSPF, RIP, static, connected).
- When OSPF redistributes, the administrator may optionally specify a metric, metric type
(external type 1 or external type 2), and a tag value. The administrator may specify whether
OSPF redistributes subnetted routes.
- When RIP redistributes, the administrator may optionally specify a metric. When RIP
redistributes from OSPF, the administrator may specify one or more types of OSPF routes to
be accepted. Valid values are internal, external 1, external 2, NSSA external 1, and NSSA
external 2.
- For each pair of source and destination routing protocols, the administrator may optionally
specify an access list to filter routes by destination address and mask.

Route Preferences

Use route preference to configure the default preference for each protocol (e.g. 60 for
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Introduction
Lan Switch and Router Blade