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How to realize the VRRP + DHCP server active/standby switchover business of the S5700 exchange?

Publication Date:  2012-09-20 Views:  584 Downloads:  0
Issue Description
2 sets S5700 deploy VRRP protocol, and each business VLAN are deployed the VRRP. Now users need S5700 work as DHCP server and assign IP addresses for each VLAN. At the same time, realize active/standby switchover, the standby exchange can continue to assign IP addresses and will not lead to address conflict after the active switch DOWN, namely can also synchronous active/standby switchover with VRRP when work as DHCP server.
Alarm Information
Handling Process
S5700 switches support the function as follows:
1  need to upgrade the software version to V100R006C00SPC800 or later version, V100R005C01 and earlier version does not support.
2 Configure the same address pool to active/standby of VRRP,  which use virtual IP as the gateway;
3 VRRP active/standby address pool should include different address section, can through run the excluded - IP - address command in address pool view, separate the VRRP active/standby address section;
For example VRRP active/standby address pool configuration is as follows:
IP pool test
Gateway - list
Network mask
In the VRRP master, address pool view configuration:
Excluded - IP - address
In the VRRP standby, address pool view configuration:
Excluded - IP - address
4 all new access users can only acquire address from the current master VRRP.
5 Exclude the real address of both the master and backup VRRP with exclude command in two address pool view to avoid address conflict.
Root Cause
1 If VRRP doesn’t realize active/standby switchover, the client will can’t perception normal on-line completely and use VRRP virtual IP as the gateway.
2 If part of the users access the address, the VRRP realize active/standby switchover; the users accessed the address can normal online in the lease, when the lease is over, need to apply for a address again; the users online after active/standby switchover have no perception.
3 In the network planning address section, only half of which can be used at the same time. So when planning the network, need extra planning one time the IP address, this cost more IP address resource. Need to have full consideration on IP resources and planning before using this scheme.