This chapter explains how to configure and monitor SmartTRUNKs on the X-Pedition router. A SmartTRUNK is Enterasys Networks’ technology for load balancing and load sharing. A SmartTRUNK is a group of two or more ports that are logically combined into a single port. Multiple physical connections between devices are aggregated into a single logical,high-speed path that acts as a single link. Traffic is balanced across all interfaces in the combined link, increasing overall available system bandwidth. SmartTRUNKs allow administrators the ability to increase bandwidth at congestion points in the network, thus eliminating potential traffic bottlenecks. SmartTRUNKs also provide improved data link resiliency. If one port in a SmartTRUNK should fail, itsload is distributed evenly among the remaining ports and the entire SmartTRUNK link remains operational. Note: SmartTRUNKs may benefit from enabling flow bridging on all receiving ports. This will add both src and dst fields into the flow distribution.
SmartTRUNK is Enterasys standard for building high-performance links between Enterasys switching platforms. SmartTRUNKs can interoperate withswitches, routers, and servers from other vendors as well as Enterasys platforms. SmartTRUNKs are compatible with all X-Pedition features, including VLANs, STP, VRRP, etc. SmartTRUNK operation is supported over different media types and a variety of technologies including 10/100/1000 Mbps Ethernet. SmartTRUNK operation also supports 10 Gigabit-Ethernet with no protocol or 802.3ad only. Note: Whenyou enable Spanning Tree Protocol (STP) or Multiple Spanning Tree Protocol (MSTP) with a SmartTRUNK that consists of ports of the same type, Enterasys recommends that the ports in the SmartTRUNK be neighbors (i.e., in consecutive order) on the same line card. If you configure a SmartTRUNK to carry traffic for an IP VLAN and traffic for the Layer-2 default VLAN, Enterasys recommends that youconfigure the SmartTRUNK as an 802.1Q trunk. With the trunk configured, disable and re-enable the SmartTRUNK.
Enterasys X-Pedition User Reference Manual
To configure a SmartTRUNK, perform the following tasks: 1. 2. 3. Create a SmartTRUNK and specify a control protocol for it. Add physical ports to the SmartTRUNK. Specify the policyfor distributing traffic across SmartTRUNK ports (optional). By default, the X-Pedition router distributes traffic to ports in a round-robin (sequential) manner. The maximum number of SmartTRUNKs you may configure depends on the router you are using: X-Pedition 2000 router allows up to 40 X-Pedition 8000 router allows up to 64 X-Pedition 8600 router router allows up to 128 ER-16 allows up to 256Note: When using firmware version E184.108.40.206 or later, the ER-16 supports SmartTRUNKs that use the lower index ranges of 1-240 only (i.e., st.1–st.240).
Creating a SmartTRUNK
When you create a SmartTRUNK, you must specify if you will use the DEC Hunt Group control protocol, LACP, or if you will not use any control protocol: • If you connect the SmartTRUNK to another X-Pedition router,other Enterasys devices such as the SmartSwitch 6000 or SmartSwitch 9000, or Digital GIGAswitch/Router, specify the DEC Hunt Group control protocol. The Hunt Group protocol is useful in detecting errors like transmit/receive failures and misconfiguration. Note: When SmartTRUNKing to an Ethernet GIGASwitch product, set the port set command’s IFG parameter to 4 or greater to allow the GIGASwitchenough time to properly process incoming frames.
If you connect the SmartTRUNK to a device that does not support the DEC Hunt Group control protocol, such as those devices that support Cisco’s EtherChannel technology, specify no control protocol. This mode detects only link failures. If you configure the SmartTRUNK for 802.3ad link aggregation, specify the Link Aggregation Control Protocol...