Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 834)

804 Multi-Service IronWare Switching Configuration Guide
53-1003036-02
Configuring IP load sharing
19
The show bfd neighbors details output indicates that BFD monitoring is enabled by the static and
static6.
Brocade# show bfd neighbors details 20.0.0.3
NeighborAddress State Interface Holddown Interval R/H
20.0.0.3 UP eth 1/5 300000 100000 Y/M
Registered Protocols(Protocol/VRFID): static/0
Local: Disc: 3, Diag: 0, Demand: 0 Poll: 0
MinTxInterval: 100000, MinRxInterval: 100000, Multiplier: 3
Remote: Disc: 5, Diag: 0, Demand: 0 Poll: 0
MinTxInterval: 100000, MinRxInterval: 100000, Multiplier: 3
Stats: RX: 89596 TX: 87853 SessionUpCount: 1 at SysUpTime: 0:5:10:53.575
Session Uptime: 0:1:0:16.300, LastSessionDownTimestamp: 0:0:0:0.0
Tx Port: eth 1/1(eth 1/1),Rx Port: eth 1/1(eth 1/1)
Using PBIF Assist: Y
Brocade#
Configuring IP load sharing
The IP route table can contain more than one path to a given destination. When this occurs, the
Brocade device selects the path with the lowest cost as the path for forwarding traffic to the
destination. If the IP route table contains more than one path to a destination and the paths each
have the lowest cost, then the Brocade device uses IP load sharing to select a path to the
destination.
1
IP load sharing is based on the destination address of the traffic. Brocade devices support load
sharing based on individual host addresses or on network addresses.
You can enable a Brocade device to load balance across up to eight equal-cost paths. The default
maximum number of equal-cost load sharing paths is four.
NOTE
IP load sharing is not based on source routing, only on next-hop routing.
NOTE
The term “path” refers to the next-hop router to a destination, not to the entire route to a destination.
Thus, when the software compares multiple equal-cost paths, the software is comparing paths that
use different next-hop routers, with equal costs, to the same destination.
In many contexts, the terms “route” and “path” mean the same thing. Most of the user
documentation uses the term “route” throughout. The term “path” is used in this section to refer to
an individual next-hop router to a destination, while the term “route” refers collectively to the
multiple paths to the destination. Load sharing applies when the IP route table contains multiple,
equal-cost paths to a destination.
NOTE
The Brocade device also performs load sharing among the ports in aggregate links.
1. IP load sharing is also called “Equal-Cost Multi-Path (ECMP)” load sharing or just “ECMP”