Cisco ASR 903 Manual page 19

Layer 2 Solution
Three modes are supported on the Cisco ASR 903 router.
• LACP—channel-group 1 mode { active | passive}
• On—channel-group 1
On mode will force member link into port-channel whether other end joins or not. On mode is not recommended
as traffic can be black holed if the peering end does not join port-channel. Here is the command to force interface
into port-channel.
interface GigabitEthernet0/0/1
no ip address
negotiation auto
channel-group 5
Load-balancing can be achieved based on MAC address or IP address of source and destination packets. Port-
channel load balancing can be configured globally for all the port-channels; individual port channel load balancing
command is not supported. Here are the commands to configure port-channel load balancing.
Configure terminal
port-channel load-balance-hash-algo
dst-ip
dst-mac
src-dst-ip
src-dst-mac
src-ip
src-mac
In the example below, gig0/1/1 and gig0/1/2 is member of port-channel1.
172.16.10.0/24 - SubnetA
ASR903-CE1
Customer A
Site 1
172.16.11.0/24 - SubnetB
ASR903-PE1 and ASR903-PE2 Configuration
interface Port-channel1
no ip address
no negotiation auto
service instance 1 ethernet
encapsulation untagged
l2protocol peer
bridge-domain 1
OL-30526-01
Destination IP
Destination MAC
Source XOR Destination IP Addr
Source XOR Destination MAC
Source IP
Source MAC
Figure 4. Ethernet Port-Channel
10 10 30 10
ASR903-PE1
Gi0/1/1 Gi0/1/0 Gi0/1/1
Gi0/1/2
11 11 40 11
! l2protocol peering is needed for lacp if evc is configured
! using on mode
{option}
30 10 10
ASR903-PE2
Gi0/1/1 Gi0/1/0
Gi0/1/2
40 11 11
10
172.16.10.0/24 – SubnetA
ASR903-CE2
Gi0/1/2
Customer A
Site 2
172.16.11.0/24 – SubnetB
11
Cisco ASR 903 Router Design and Deployment Guide▄
Ethernet Port-channel ▀
19