236 Nokia Network Voyager for IPSO 4.0 Reference Guidebalancing across the ports. For example, you can aggregate two 10/100 mbps ports so theyfunction like a single port with a theoretical bandwidth of 200 mbps, and you can aggregate twoGigabit Ethernet ports so they function like a single port with a theoretical bandwidth of 2000mbps. If you have only 10/100 interfaces and need a faster link but can’t or don’t want to useGigabit Ethernet, you can use link aggregation to achieve faster throughput with the interfacesyou already have.Another benefit of link aggregation is redundancy—if one of the physical links in an aggregationgroup fails, the traffic is redistributed to the remaining physical links and the aggregation groupcontinues to function. IPSO distributes the outbound IP traffic across the physical links using thesource and destination IP addresses. It uses the source and destination MAC addresses todistribute non-IP traffic.You can aggregate as many as four ports in one aggregation group, and you can have as many aseight aggregation groups on one appliance.You can hot swap NICs that have ports participating in an aggregation group. If the group hasports on other NICs, the traffic is distributed to those ports and the aggregation group continuesto function when you remove a NIC in this manner. If you reinsert the NIC, the appropriate portsrejoin the aggregation group and resume forwarding traffic automatically.Managing Link Aggregation Using SNMPNokia IPSO systems use a proprietary SNMP MIB to manage link aggregation. To incorporatelink aggregation into your SNMP-based management, perform the following tasks: Copy the file NOKIA-IPSO-LINKAGGREGATION-MIB.txt to your management system.This file is located at /etc/snmp/mibs/. In Network Voyager or the IPSO CLI, enable the following traps: Enable lamemberActive traps Enable lamemberInactive trapsNoteIPSO does not use the standard IEEE8023-LAG-MIB to support link aggregation.Configuring Switches for Link AggregationObserve the following considerations when you configure a switch to support link aggregationin combination with a Nokia appliance: You must configure the appropriate switch ports to use static link aggregation. (On Ciscoswitches, this means you must enable EtherChannel.) That is, if you aggregate four portsinto one group on your Nokia appliance, the four switch ports that they connect to muststatic link aggregation.
