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Configuration Guide - Device Management

S9300, S9300E, and S9300X V200R012C00

This document describes the configurations of Device Management, including device status query, hardware management, CSS, SVF, PoE, OPS, OIDS, energy-saving management, information center, fault management, NTP, synchronous ethernet, PTP.
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Cluster Link Aggregation and Local Preferential Forwarding

Cluster Link Aggregation and Local Preferential Forwarding

Cluster Link Aggregation

CSS supports cluster link aggregation (Eth-Trunk). Physical Ethernet interfaces on different member switches can bundle into an Eth-Trunk interface, which is connected to upstream or downstream devices. If a member switch or an Eth-Trunk member link fails, data flows are forwarded through the cluster cables between member switches. Cluster link aggregation ensures reliable data transmission and implements backup between member switches. Cluster link aggregation is important to the core switching system and networks with high QoS requirements. It prevents service interruptions caused by single-point failures and greatly improves network availability.

In Figure 3-6, traffic sent to the core device on a network is equally distributed to member links of an Eth-Trunk set up between CSS member switches. If a member link fails, traffic on this link is distributed to the other link through the cluster cables between the member switches. This link backup mechanism improves network reliability.

Figure 3-6  Cluster link aggregation 1

In Figure 3-7, traffic sent to the core device on the network is equally distributed to member links of an Eth-Trunk set up between CSS member switches. If one member switch fails, traffic toward this switch is distributed to the other switch. This device backup mechanism improves network reliability.

Figure 3-7  Cluster link aggregation 2

Local Preferential Forwarding

To implement reliable data traffic transmission and backup between member switches, a CSS is typically connected to upstream and downstream devices through inter-chassis Eth-Trunk links. Similar to a standalone switch, a CSS uses the hash algorithm to select outbound interfaces in an inter-chassis Eth-Trunk. Therefore, traffic is load balanced among the Eth-Trunk member links, and some traffic is forwarded across member switches.

Inter-chassis forwarding consumes bandwidth of cluster cables. As bandwidth of cluster cables is limited, this forwarding mode increases load on cluster cables and reduces traffic forwarding efficiency. To improve traffic forwarding efficiency and reduce traffic on cluster cables, the switch provides the local preferential forwarding function, which preferentially forwards local switch traffic through a local interface. If the local device has no outbound interface or all outbound interfaces fail, the traffic is forwarded through an interface on the other member switch.

In Figure 3-8, SwitchA and SwitchB set up a CSS, and their uplink and downlink interfaces bundle into Eth-Trunk interfaces. If local preferential forwarding is not configured, traffic reaching SwitchA is load balanced between the Eth-Trunk member links, and some traffic is forwarded through the cluster cables and sent out from a physical interface on SwitchB. If local preferential forwarding is configured, traffic reaching SwitchA is preferentially forwarded through a physical interface of SwitchA, without traversing the cluster cables. By default, the local preferential forwarding function is enabled on the switch.

Figure 3-8  Local preferential forwarding
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Updated: 2018-09-03

Document ID: EDOC1100038289

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