Article ID: 14966
G-Series, firmware 6.42.10.0016 through 6.61.08.0013
C5-Series; firmware 6.42.10.0016 through 6.61.08.0013, 6.71.01.0067 through 6.71.02.0008
C3-Series, firmware 6.42.10.0016 through 6.61.08.0013
B5-Series; firmware 6.42.10.0016 through 6.61.08.0013, 6.71.01.0067 through 6.71.02.0008
A4-Series; firmware 6.61.02.0007 through 6.61.08.0013, 6.71.01.0067 through 6.71.02.0008
Used the 'ip helper-address...' command to configure two or more IP Helpers (5720
) onto the local router process, under a total of one or more VLAN interfaces.
Used the 'no ip helper-address...' command to delete one of the IP Helper entries.
The IP Helper is not forwarding certain broadcast traffic as it should.
DHCP and other configured 'ip forward-protocol...' features (11980
) are not operating beyond the source subnet.
The issue affects all VLAN interfaces on the router.
Upgrade to 6.61 firmware 6.61.09.0012 or higher.
state, in the 'Changes and Enhancements in 6.61.09.0012' section:
18103 Corrected an issue where removing an IP Helper address from one interface prevented its use globally.
Also fixed as of C5/B5/A4-Series firmware 6.71.03.0025 (though not stated in release notes).
Add another 'ip helper-address...' command to any routed VLAN interface, even if the address already exists ("Error: IP Address is already configured on this router interface").
This can as desired specify a "dummy" IP address, such as "22.214.171.124".