Specifications

Distribution Layer April 2014
77
no shutdown
!
interface vlan 100
ip address 10.4.0.1 255.255.255.0
ip helper-address 10.4.48.10
ip pim sparse-mode
!
interface vlan 101
ip address 10.4.1.1 255.255.255.0
ip helper-address 10.4.48.10
ip pim sparse-mode
!
interface vlan 115
ip address 10.4.15.1 255.255.255.128
ip pim sparse-mode
Procedure 8 Connect to LAN core or WAN router
Any links to connected WAN routers or a LAN core layer should be Layer 3 links or Layer 3 EtherChannels. The
LAN design does not extend Layer 2 VLANs beyond the distribution layer.
Option 1: Connect distribution layer switch to WAN router
When the LAN distribution layer connects to a WAN router this may present a number of scenarios:
• The distribution layer switch is a collapsed core HQ location connecting to one or more WAN headend routers.
• The distribution layer switch is collapsed core for a larger remote site with multiple WAN routers for
survivability.
• The distribution layer switch is a WAN aggregation switch with a number of WAN headend routers
connected to it for a modular block connecting to a LAN Core switch.
Because of the number of combinations, further investigation may be necessary to adjust for the LAN
connectivity that matches your deployment scenario.
Option 2: Connect distribution layer switch to LAN core switch
Step 1: Configure the Layer 3 interface.
If you are using an EtherChannel to connect to the LAN core, the interface type will be port-channel and
the number must match the channel-group number you will configure in Step 3. When configuring a Layer
3 EtherChannel, the logical port-channel interface is configured prior to configuring the physical interfaces
associated with the EtherChannel.
interface [interface type] [number]
description Link to {your device here}
no switchport
ip address [ip address] [mask]
ip pim sparse-mode
logging event link-status
carrier-delay msec 0
no shutdown