Cisco 10000-2P2-2DC Software Guide - Page 239
Restrictions for IP Unnumbered on VLANs, Configuration Tasks for IP Unnumbered on VLANs
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Chapter 7 Configuring IP Unnumbered on IEEE 802.1Q VLANs Restrictions for IP Unnumbered on VLANs Restrictions for IP Unnumbered on VLANs The IP Unnumbered on VLANs feature has the following restrictions: • You can configure IP unnumbered on only Ethernet VLAN subinterfaces and point-to-point interfaces. • If you configure more than 14,000 IP unnumbered subinterfaces and you have configured EIGRP on all interfaces on a router, the router can stop responding. To avoid this problem, use the passive-interface default command (which disables all router interfaces from sending routing updates) and then configure the no passive-interface command on selected interfaces you want to send routing updates. Configuration Tasks for IP Unnumbered on VLANs To configure the IP Unnumbered on VLANs feature, perform at least one of the following configuration tasks: • Configuring IP Unnumbered for an Ethernet VLAN Subinterface, page 7-3 • Configuring IP Unnumbered for a Range of Ethernet VLAN Subinterfaces, page 7-4 Configuring IP Unnumbered for an Ethernet VLAN Subinterface To configure IP unnumbered for an Ethernet VLAN subinterface, enter the following commands beginning in global configuration mode: Step 1 Step 2 Step 3 Command Purpose Router(config)# interface type number slot/module/port.subinterface Configures a subinterface and enters subinterface configuration mode. Router(config-subif)# encapsulation dot1q Enables IEEE 802.1Q encapsulation of traffic on a specified vlan-id [native] subinterface in a virtual LAN (VLAN). IEEE 802.1 Q enscapsulation is disabled by default. The vlan-id argument is the virtual LAN identifier. Valid values are from 1 to 4095. The native option sets the VLAN ID value of the port to the value you specify in the vlan-id argument. Router(config-subif)# ip unnumbered type number Enables IP processing on a serial interface without assigning an explicit IP address to the interface. IP unnumbered is disabled by default. The type and number arguments indicate the type and number of another interface on which the router has an assigned IP address. It cannot be another unnumbered interface. OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 7-3
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