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Configuration Guide - IP Service

S7700 and S9700 V200R013C00

This document describes the configurations of IP service, including IP address, ARP, DHCP, 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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IP Address Assignment is Slow

IP Address Assignment is Slow

Possible Cause 1

Multiple DHCP servers are deployed on the network.

Verification

Determine whether the expected DHCP server allocates network parameters.

Solution

Configure DHCP snooping on the client. This configuration ensures that the client receives DHCP messages from only the trusted DHCP server. For details, see "Inserting the Option 82 Field in a DHCP Message" in S7700 and S9700 V200R013C00 Configuration Guide - Security.

Possible Cause 2

Broadcast traffic suppression is configured and DHCP Discover messages exceeding the specified threshold are discarded.

Verification

Check whether broadcast traffic suppression is configured between the DHCP server and client. Run:
display flow-suppression interface

Solution

Adjust the broadcast traffic suppression threshold. Run:
broadcast-suppression

Possible Cause 3

The network is under attack.

Verification

Check statistics about packets sent to the DHCP server's CPU and determine the MAC address at the source of the attack. Run:
display cpu-defend statistics

Solution

Add the MAC address at the source of the attack to the blacklist. For details, see "Configuring CPU Attack Defense" in S7700 and S9700 V200R013C00 Configuration Guide - Security - Local Attack Defense Configuration.

Possible Cause 4

STP is enabled on the DHCP server or relay agent.

Verification

Check whether STP is enabled. Run:
display stp

Solution

To disable STP, run:
undo stp enable
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Updated: 2019-04-20

Document ID: EDOC1100065743

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