Cisco ASR1002-10G-VPN/K9 Software Guide - Page 290
Gigabit Ethernet Port Numbering, IP Address Handling in ROMmon and the Management Ethernet Port, - vpn router
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Gigabit Ethernet Port Numbering Chapter 9 Using the Management Ethernet Interface 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. In dual RP configurations, however, users should never configure the IP address in the ROMmon on either RP0 or RP1 to match each other or the IP address as defined by the IOS CLI. Configuring matching IP addresses introduces the possibility for an active and standby Management Ethernet interface having the same IP address with different MAC addresses, which will lead to unpredictable traffic treatment. Gigabit Ethernet Management Interface VRF The Gigabit Ethernet Management interface is automatically part of its own VRF. This VRF, which is named "Mgmt-intf," is automatically configured on the Cisco ASR 1000 Series Router and is dedicated to the Management Ethernet interface; no other interfaces can join this VRF. Therefore, this VRF does not participate in the MPLS VPN VRF or any other network-wide VRF. Placing the management ethernet interface in its own VRF has the following effects on the Management Ethernet interface: • Many features must be configured or used inside the VRF, so the CLI may be different for certain Management Ethernet functions on the Cisco ASR 1000 Series Routers than on Management Ethernet interfaces on other routers. Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 9-2 OL-16506-10