Cisco ASR1002 Configuration Guide - Page 332

Gigabit Ethernet Management Interface Overview Using the Management Ethernet Interface Gigabit Ethernet Management Interface Overview The purpose of this interface is to allow users to perform management tasks on the router; it is basically an interface that should not and often cannot forward network traffic but can otherwise access the router, often via Telnet and SSH, and perform most management tasks on the router. The interface is most useful before a router has begun routing, or in troubleshooting scenarios when the SPA interfaces are inactive. The following aspects of the Management Ethernet interface should be noted: • Each RP has a Management Ethernet interface, but only the active RP has an accessible Management Ethernet interface (the standby RP can be accessed using the console port, however). • IPv4, IPv6, and ARP are the only routed protocols supported for the interface. • The interface provides a method of access to the router even if the SPA interfaces or the IOS processes are down. • The Ethernet Management Interface cannot be used as a Lawful Intercept MD source interface. • The Management Ethernet interface is part of its own VRF. This is discussed in more detail in the "Gigabit Ethernet Management Interface VRF" section on page 3. Gigabit Ethernet Port Numbering The Gigabit Ethernet Management port is always GigabitEthernet0. In a dual RP configuration, the Management Ethernet interface on the active RP will always be Gigabit Ethernet 0, while the Management Ethernet interface on the standby RP will not be accessible using the Cisco IOS CLI in the same telnet session. The standby RP can be telnetted to through the console port, however. The port can be accessed in configuration mode like any other port on the Cisco ASR 1000 Series Routers: Router#config t Enter configuration commands, one per line. Router(config)#interface gigabitethernet0 Router(config-if)# End with CNTL/Z. IP Address Handling in ROMmon and the Management Ethernet Port On the Cisco ASR 1000 Series Routers, IP addresses can be configured in ROMmon (the IP_ADDRESS= and IP_SUBNET_MASK= commands) and through the use of the IOS command-line interface (the ip address command in interface configuration mode). Assuming the IOS process has not begun running on the Cisco ASR 1000 Series Router, the IP address that was set in ROMmon acts as the IP address of the Management Ethernet interface. In cases where the IOS process is running and has taken control of the Management Ethernet interface, the IP address specified when configuring the Gigabit Ethernet 0 interface in the IOS CLI becomes the IP address of the Management Ethernet interface. The ROMmon-defined IP address is only used as the interface address when the IOS process is inactive. For this reason, the IP addresses specified in ROMmon and in the IOS CLI can be identical and the Management Ethernet interface will function properly in single RP configurations. Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 2