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Configuration Guide - IP Service

S1720, S2700, S5700, and S6720 V200R012(C00 and C20)

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.
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Connecting a Device to an NLB Cluster (Using Physical Link Loopback)

Connecting a Device to an NLB Cluster (Using Physical Link Loopback)

Context

All servers in an NLB cluster use the same cluster IP address and cluster MAC address. An NLB cluster can work in unicast or multicast mode where the cluster MAC address is a unicast or multicast MAC address accordingly. When a device is directly connected to NLB servers and functions as their access gateway, the device sends a packet from clients to the cluster IP address, where it is forwarded to every server in the NLB cluster. The servers themselves determine whether to process the packet. If a device does not support multi-interface ARP, physical link loopback can be used to enable the device to send the packet destined for the cluster IP address to each server in an NLB cluster.

The networking for physical link loopback varies depending on the switch system (a single switch, stack system or VRRP group). For details, see Interworking with an NLB Cluster. The configurations include disabling STP, RSTP, VBST, or MSTP, and configuring a static ARP entry (only when an NLB cluster works in multicast mode).

Procedure

  1. Disable STP, RSTP, VBST, or MSTP.

    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run undo stp enable or stp disable

      STP, RSTP, VBST, or MSTP is disabled.

      By default, STP, RSTP, VBST, or MSTP is enabled on devices.

    4. Run quit

      Return to the system view.

  2. Configure a static ARP entry (only when an NLB cluster works in multicast mode).

    1. Run system-view

      The system view is displayed.

    2. Run arp static ip-address mac-address vid vlan-id interface interface-type interface-number

      The static ARP entry is configured.

      In the static ARP entry, the IP address is the cluster IP address, the MAC address is the cluster multicast MAC address, and the outbound interface is the interface where the VLAN to which the NLB cluster's gateway belongs is configured.

Verifying the Configuration

Run the display arp static command to verify static ARP entries.

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Updated: 2018-12-24

Document ID: EDOC1100038342

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