Specifications

Core Layer April 2014
101
Step 1: Configure the Layer 3 interface.
When using an EtherChannel to connect to a distribution layer platform, the interface type will be portchannel
and the number must match the channel-group number you will configure in Step 2. 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
If the interface type is not a port-channel, then an additional command macro apply EgressQoS must also be
configured on the interface.
Step 2: If the routing protocol you are using is OSPF, you add the router neighbor authentication to the interface.
The chosen password must match the neighbor peer, and this OSPF interface authentication information is used
in addition to the authentication information supplied in a previous step of the core layer configuration.
interface [interface type] [number]
ip ospf message-digest-key 1 md5 [password]
Step 3: If you are connecting to the same distribution layer switch with multiple links, you can use a portchannel
for added bandwidth over a single logical link. Configure the physical interfaces to tie to the logical port channel
by using the channel-group command. The number for the port channel and channel group are matched.
Also, apply the egress QoS macro that was defined in the platform configuration procedure to ensure traffic is
prioritized appropriately.
The Cisco Catalyst 6500 and Catalyst 6800 Series Switches have two egress QoS
macros: EgressQoSOneGig, which is used for Gigabit Ethernet ports, and EgressQoS,
which is used for 10-Gigabit or 40-Gigabit Ethernet ports.
Tech Tip
interface [interface type] [port 1]
description Link to {your device here} Port 1
interface [interface type] [port 2]
description Link to {your device here} Port 2
interface [interface type] [port 3]
description Link to {your device here} Port 3
interface [interface type] [port 4]
description Link to {your device here} Port 4
!
interface range [interface type] [port 1], [interface type] [port 2], [interface
type] [port 3], [interface type] [port 4]
no switchport