Quick Reference Guide

248 | Layer 3 Routing
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Enabling Routing
The S-Series always provides Layer 2 bridging, while Layer 3 routing must be explicitly enabled, first for
the S-Series router as a whole, and then for each port that is to participate in the routed network.
As introduced in the Getting Started chapter, use the
show version command (see Figure 3-8 on page 35)
to verify that the Routing package (“Layer 3 Package”) of SFTOS is installed in order to utilize these
routing procedures.
Then, to inspect the system for configured Layer 3 interfaces, use the
show ip interface brief command (see
Figure 3-16 on page 41).
For more details about a specific interface, use the following commands (Note, however, that routing must
be enabled before these commands produce a report.):
•
show ip interface unit/slot/port: See Figure 3-15 on page 40.
• show ip interface vlan vlan-ID
To view IP information on a Layer 3 interface, use the show ip interface command in the Privileged Exec
mode (Figure 17-218).
Figure 17-218. show ip interface Command Example
The configuration commands used in the example in this section enable IP routing on ports 1/0/2, 1/0/3, and
1/0/5. The router ID will be set to the management IP address of the S50 stack, or to that of any active
router interface if the management address is not configured.
After the routing configuration commands have been issued, the following functions will be active:
• IP Forwarding, responsible for forwarding received IP packets
• ARP Mapping, responsible for maintaining the ARP Table used to correlate IP and MAC addresses.
The table contains both static entries and entries dynamically updated based on information in received
ARP frames.
• Routing Table Object, responsible for maintaining the common routing table used by all registered
routing protocols
You may then activate RIP or OSPF, used by routers to exchange route information, on top of IP Routing.
RIP is more often used in smaller networks, while OSPF was designed for larger and more complex
topologies.
Force10 >show ip int vlan 58
Vlan 58 is up, line protocol is up
Internet address is 1.1.49.1/24
Broadcast address is 1.1.49.255
Address determined by config file
MTU is 1554 bytes
Inbound access list is not set
Proxy ARP is enabled
Split Horizon is enabled
Poison Reverse is disabled
ICMP redirects are not sent
ICMP unreachables are not sent