Enterasys Networks X-PeditionTM manual Static Routes, Vlan Routing

IP Routing Protocols

–Static routes: 1

–BGP external routes: 20

–OSPF intra-area routes: 108

–OSPF inter-area routes: 110

–OSPF external routes: 112

–RIP routes: 120

–BGP internal routes: 200

–Values between 241 and 255 are reserved for internal use

•The show ip route command displays distances and metrics.

Refer to the XSR CLI Reference Guide for more information on commands.

Static Routes

Static routes are used when a dynamic route to a destination cannot be set up or to specify what the XSR will route to. The XSR creates static routes with the ip route command. Refer to the XSR CLI Reference Guide for more information and sample static route configurations.

The XSR’s Static Route Manager (SRM) allows configuration of multiple static routes to the same destination but with different hop and distance values. You can cap the number of these routes with ip route maximum_multiple.

The SRM validates and forwards all reachable static routes to the Routing Table Manager (RTM) which saves them but implements only the best (lowest distance) route. Unreachable static routes are saved in the SRM for later use should they become reachable.

When an interface is enabled, all static routes accessible through that interface are stored in the RTM. Also, for multi-point interfaces, when a neighbor becomes accessible, all the best static routes accessible through that neighbor are saved in the RTM. Conversely, when an interface is disabled, all static routes accessible through that interface are deleted from the RTM. The same holds true on multi-point interfaces.

VLAN Routing

Virtual Local Area Networks (VLANs) allow groups of end systems, possibly on multiple physical LAN segments, to communicate as if they were a common LAN unconstrained by the network's physical layout. VLAN switches can be used to establish different broadcast domains within networks but different VLANs cannot communicate with one another through VLAN switches because routing is still required for inter-VLAN traffic. The XSR’s VLAN route traffic among IEEE 802.1Q VLANs.

The IEEE 802.1Q standard documents the insertion of a VLAN tag, shown in Figure 5-1, between the Source MAC address and the Length/Type of an Ethernet frame to identify the VLAN to which the frame belongs.

5-18 Configuring IP