Cisco 7604 User Manual

22-2
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 22 Configuring Layer 3 Interfaces
Layer 3 Interface Configuration Guidelines and Restrictions
Layer 3 Interface Configuration Guidelines and Restrictions
When configuring Layer 3 interfaces, follow these guidelines and restrictions:
• We recommend that you configure no more than 2,000 Layer 3 VLAN interfaces.
• Release 12.2(18)SXE and later releases supports the ip unnumbered command on Layer 3 VLAN
interfaces.
• Release 12.2(18)SXE and later releases supports the [no] ip dhcp route [connected | static ]
command.
• To support VLAN interfaces, create and configure VLANs and assign VLAN membership to
Layer 2 LAN ports. For more information, see Chapter 14, “Configuring VLANs” and Chapter 13,
“Configuring VTP.”
• Cisco 7600 series routers do not support:
– Integrated routing and bridging (IRB)
– Concurrent routing and bridging (CRB)
– Remote source-route bridging (RSRB)
• Use bridge groups on VLAN interfaces, sometimes called fall-back bridging, to bridge nonrouted
protocols. Bridge groups on VLAN interfaces are supported in software on the MSFC.
• Cisco 7600 series routers do not support the IEEE bridging protocol for bridge groups. Configure
bridge groups to use the VLAN-bridge or the DEC spanning-tree protocol.
Configuring Subinterfaces on Layer 3 Interfaces
When configuring Layer 3 subinterfaces, follow these guidelines and restrictions:
• With a PFC3, Release 12.2(18)SXE and later releases support these features on LAN port
subinterfaces:
– IPv4 unicast forwarding, including MPLS VPN
– IPv4 multicast forwarding, including MPLS VPN
– 6PE
– EoMPLS
– IPv4 unnumbered
– Counters for subinterfaces in MIBS and with the show vlans command
– iBGP and eBGP
– OSPF
– EIGRP
– RIPv1/v2
– RIPv2
– ISIS
– Static routing
– Unidirectional link routing (UDLR)
– IGMPv1, IGMPv2, IGMPv3

Cisco 7604 Specifications

General

Brand	Cisco
Model	7604
Category	Network Router
Language	English