Mpls Configuration Examples - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

MPLS Label Switching
Basic MPLS Load Balancing
The maximum number of load balancing paths is 8. The PFC3B forwards MPLS labeled packets without
explicit configuration. If the packet has three labels or less and the underlying packet is IPv4, then the
PFC3B uses the source and destination IPv4 address. If the underlying packet is not IPv4 or more than
three labels are present, the PFC3B parses down as deep as the fifth or lowest label and uses it for
hashing.
MPLS Layer 2 VPN Load Balancing
Load balancing is based on the VC label in the MPLS core if the first nibble of the MAC address in the
customer Ethernet frame is not 4.
Note Load balancing is not supported at the ingress PE for Layer 2 VPNs.
MPLS Layer 3 VPN Load Balancing
MPLS Layer 3 VPN load balancing is similar to basic MPLS load balancing. For more information, see
the

MPLS Configuration Examples

The following is an example of a basic MPLS configuration:
*****
Basic MPLS
*****
IP ingress interface:
Router# mpls label protocol ldp
interface GigabitEthernet6/2
ip address 75.0.77.1 255.255.255.0
media-type rj45
speed 1000
end
Label egress interface:
interface GigabitEthernet7/15
mtu 9216
ip address 75.0.67.2 255.255.255.0
logging event link-status
mpls ip
Router# show ip route 188.0.0.0
Routing entry for 188.0.0.0/24, 1 known subnets
O IA
Router#sh ip ro 88.0.0.0
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
21-8
"Basic MPLS Load Balancing" section on page
188.0.0.0 [110/1] via 75.0.77.2, 00:00:10, GigabitEthernet6/2
Chapter 21 Configuring Multiprotocol Label Switching
21-8.
OL-11439-03