How to realize the VRRP + DHCP server active/standby switchover business to S5700 switch (V100R005C01)

Publication Date:  2012-09-27 Views:  555 Downloads:  0
Issue Description
2 sets of S5700 deployed VRRP protocol, and each business VLAN are deployed the VRRP. Now users need use S5700 as DHCP server to assign IP address for each VLAN. If the main switch is DOWN, the backup switch can continue to assign IP addresses and will not lead to address conflict, namely when used as DHCPserver can also synchronous active/standby switchover with VRRP.
Alarm Information
None.
Handling Process
The support that S5700 switches to the function is as follows:
1, Need to upgrade the software version to V100R006C00SPC800 or the version after it, V100R005C01 and pre-versions don’t support.
2, The main and backup of VRRP configure the same address pool, in which use virtual IP as gateway;
3, The main and backup of VRRP address pool should include different address segments, can through the excluded-IP-address command in address pool view separate the main and backup address segments of VRRP;
For example the configuration of VRRP main and backup address pool is as follows:
#
IP pool test
Gateway - list 10.0.1.1
Network 10.0.1.0 mask 255.255.255.0
#
In the master of VRRP, the configuration in address pool view:
Excluded - IP - address 10.0.1.4 10.0.1.128
In the backup of VRRP, the configuration in address pool view:
Excluded - IP - address 10.0.1.129 10.0.1.254
4, All the new accessed users can obtain address only from the current master of VRRP.
5, Using exclude command exclude the real address of VRRP main and backup in both two address pool view to avoid address conflict.
Root Cause
None.
Suggestions
1, If the VRRP doesn’t active/standby switchover, the client can’t percept normal online completely and will use VRRP virtual IP as the gateway.
2, If part of the users access the address, the VRRP do active/standby switch; The uses obtained the address can normal online in the lease, when the lease is over, need to apply for a new address; The users online after the VRRP active/standby switchover have no perception.
3, To the planning address segments of network, the same time only half of them can be used, so when programming the network, need plan extra a times of IP address, it will cost more IP address resource. Using this scheme need prior to full consider the IP resources and planning.

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