Cisco 3845 - Security Bundle Router Software Guide

9-11
Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 9 Configuring Interfaces
Using the Ethernet Management Port
Figure 9-2 Connecting a Switch to a PC
By default, the Ethernet management port is enabled. The switch cannot route packets from the Ethernet
management port to a network port or receive routed packets from a network port.
Even though the Ethernet management port does not support routing, you might need to enable routing
protocols on the port. For example, in Figure 9-3, you must enable routing protocols on the Ethernet
management port when the PC is two or more hops away from the switch and the packets must pass
through two or more Layer 3 devices to reach the PC.
Figure 9-3 Network Example with Routing Protocols Enabled
In Figure 9-3, if the Ethernet management port and the network ports are associated with the same
routing process, the routes are propagated in this manner:
• The routes from the Ethernet management port are propagated through the network ports to the
network.
• The routes from the network ports are propagated through the Ethernet management port to the
network.
Because routing is not supported between the Ethernet management port and the network ports, traffic
cannot be sent or received between these ports. If traffic is sent or received, data packet loops occur
between the ports, which disrupts the switch and network operation. Configure route filters to avoid
routes between the Ethernet management port and the network ports and to prevent the loops.
157549
Switch
PC
Network
cloud
Ethernet
management
port
Network
ports
157551
Switch
PC
Network
cloud
Network
cloud
Ethernet
management
port
Network
ports

Cisco 3845 - Security Bundle Router Specifications

General

Brand	Cisco
Model	3845 - Security Bundle Router
Category	Switch
Language	English