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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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What Advantages and Disadvantages Do SVF Forwarding Modes Provide?

What Advantages and Disadvantages Do SVF Forwarding Modes Provide?

Leaf switches in an SVF system of fixed switches support the following forwarding modes:
  • Centralized forwarding: Leaf switches send all traffic to the parent switch for forwarding.

  • Distributed forwarding, Leaf switches look up local forwarding entries to forward traffic. If they fail to find matching entries for Layer 3 traffic, they discard the traffic. If they fail to find matching entries for Layer 2 traffic, they broadcast the traffic within the SVF system.

  • Hybrid forwarding: Leaf switches learn only local ARP and MAC address entries. (Only service ports learn entries, while ports connecting to the parent switch do not learn entries). They send broadcast and multicast traffic to the parent switch for forwarding and look up local forwarding entries to forward unicast traffic. If they fail to find the matching entries, they send unicast traffic to the parent switch for forwarding.

Table 22-42 Advantages and disadvantages of SVF forwarding modes

Forwarding Mode

Advantage

Disadvantage

Centralized forwarding

Leaf and parent switches have the same entry specifications; therefore, low-cost leaf switches can be deployed.

Leaf switches need to send all traffic to the parent switch for forwarding, leading to a high latency.

Distributed forwarding

Leaf switches forward local traffic, achieving a low latency.

The entry specifications of leaf switches depend on the specifications of leaf switches. Therefore, some functions are not supported on leaf switches.

Hybrid forwarding

Leaf and parent switches have the same entry specifications; therefore, low-cost leaf switches can be deployed.

Leaf switches forward local traffic instead of sending traffic to the parent switch for forwarding, achieving a low latency.

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Updated: 2020-01-07

Document ID: EDOC1000060766

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