H3C S7500 Series Operation Manual

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H3C S7500 Series Operation Manual Manual pdf 4 page image

Operation Manual – ClusterH3C S7500 Series Ethernet Switches Chapter 1 Cluster1-3An NDP-enabled device maintains an NDP information table. Each entry in an NDPtable ages with time. You can also clear the current NDP information manually to haveadjacent information collected again.An NDP-enabled device broadcasts NDP packets regularly to all active ports. An NDPpacket carries the holdtime field, which indicates the period for the receiving devices tokeep the NDP data. Receiving devices store only the information carried in the receivedNDP packets rather than forward them. The corresponding data entry in the NDP tableis updated when the received information is different from the existing one. Otherwise,only the holdtime of the corresponding entry is updated.1.1.3 Introduction to NTDPNTDP is a protocol for network topology information collection. NTDP provides theinformation about the devices that can be added to clusters and collects the topologyinformation within the specified hops for cluster management.Based on the NDP information table created by NDP, NTDP transmits and forwardsNTDP topology collection requests to collect the NDP information and neighboringconnection information of each device in a specific network range for the managementdevice or the network administrator to implement required functions.Upon detecting a change occurred on a neighbor, a member device informs themanagement device of the change through handshake packets. The managementdevice then collects the specified topology information through NTDP. Such amechanism enables topology changes to be tracked in time.Note:As for NTDP implementing, you need to perform configurations on the managementdevice, the member devices, and the candidate devices as follows:z On the management device, enable NTDP both globally and for specific ports, andconfigure the NTDP settings.z On each member device and candidate device, enable NTDP both globally and forspecific ports. As member devices and candidate devices adopt the NTDP settingsconfigured for the management device, NTDP setting configurations are notneeded.z NTDP takes effect in the management VLAN only. S7500 series Ethernet switchestake VLAN 1 as the management VLAN, that is, the NTDP function of the S7500series takes effect in VLAN 1 only.

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