Technical data

DATA CENTER and CAMPUS NETWORKS DEPLOYMENT GUIDE
Deploying Brocade Networks with Microsoft Lync Server 2010 23 of 52
Brocade devices support the following types of ACL-based rate limiting:
• Fixed rate limiting. Enforces a strict bandwidth limit. The device forwards traffic that is within the limit,
but either drops all traffic that exceeds the limit, or forwards all traffic that exceeds the limit at the
lowest priority level, according to the action specified in the traffic policy.
• Adaptive rate limiting. Enforces a flexible bandwidth limit that allows for bursts above the limit. You
can configure adaptive rate limiting to forward traffic, modify the IP precedence of traffic and forward it,
or drop traffic, based on whether the traffic is within the limit or exceeds the limit.
NOTE: Some Brocade switches do not support adaptive rate limiting, so consult the Release Notes to find out what
kind of rate limiting is supported.
To implement ACL-based fixed rate limiting, first create a traffic policy and then reference the policy in an extended
ACL statement. Lastly, bind the ACL to an interface. Steps are detailed below.
Create a traffic policy. Enter a command, such as:
FastIron(config)#traffic-policy TPD1 rate-limit fixed 100 exceed-action drop
Create an extended ACL entry or modify an existing extended ACL entry that references the traffic policy, for example:
FastIron(config)#access-list 101 permit ip host 210.10.12.2 any traffic-policy TPD1
Bind the ACL to an interface:
FastIron(config)#int e 5
FastIron(config-if-e5)#ip access-group 101 in
FastIron(config-if-e5)#exit
Link Aggregation
Link Aggregation (LAG) is the ability to configure multiple high-speed load sharing links between two Brocade Layer 2
switches or Layer 3 switches, or between a Brocade Layer 2 or Layer 3 switch and server.
In addition to enabling load sharing of traffic, LAG groups provide redundant, alternate paths for traffic if any of the
segments fail.
NOTE: Link aggregation is also referred to as a trunk, but not a VLAN Trunk. Cisco uses the term Etherchannel for
trunks, and Brocade uses the term LAGs.
There are two types of LAGs, static and dynamic (802.1ad Link aggregation).
Static LAGs are manually configured aggregate links that consist of multiple ports. Basically, when you configure a
static LAG, you configure the LAG once and then leave it alone. However, if you create a two-port LAG and then later
need to expand that LAG to four ports, you need to delete the existing LAG and create a new LAG. Switch LAGs are
designed to combine multiple physical ports into one logical pipe between Layer2/Layer3 switches. On all the newer
switches, 8 ports is the maximum number of ports per LAG group. Please refer to the configuration guide of the
switch you own to determine the number of ports per LAG group. The switch model you have in place determines the
way the LAG load balances traffic. Table 3 highlights the Brocade FCX and Brocade ICX™ load balancing methods: