[f-nsp] Secondary IP addressing on VE interface doesnt work!!!!!!

[Chris Gauthier]

Beware of one pitfall that I found the hard way:

interface ve 10
  ip address 192.168.0.1 255.255.255.0
  ip address 10.20.30.1 255.255.255.0
  ip helper-address 1 172.16.0.1
!

In the above configuration ALL of your IP addresses issued using DHCP
will come from the 10.20.30.0/24 network, even if you want the other
network to be the "primary" network for DHCP.  According to Foundry
support techs, "This is because When the Layer 3 Switch forwards a
BootP/DHCP request, the Switch "stamps" the Gateway Address field. The
default value the Layer 3 Switch uses to stamp the packet is the
lowest-numbered IP address (10.20.30.1) configured on the interface that
received the request. Changing this will make your DHCP work."

The command referenced is:
ip bootp-gateway 192.168.0.1

The final config would look like:
interface ve 10
  ip address 192.168.0.1 255.255.255.0
  ip address 10.20.30.1 255.255.255.0
  ip helper-address 1 172.16.0.1
  ip bootp-gateway 192.168.0.1
!

Chris Gauthier, CCNA, Network+, A+
Network Administration Team
Portland Community College
Portland, Oregon

"For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return."
--Leonardo da Vinci



Umar Ahmed wrote:
> cheers guys .. I need to learn to read properly ;)
>
> ------------------------------------------------------------------------
> *From:* foundry-nsp-bounces at puck.nether.net
> [mailto:foundry-nsp-bounces at puck.nether.net] *On Behalf Of *Charley Kline
> *Sent:* 25 June 2007 18:01
> *To:* Umar Ahmed
> *Cc:* foundry-nsp at puck.nether.net
> *Subject:* Re: [f-nsp] Secondary IP addressing on VE interface doesnt
> work!!!!!!
>
>> Hello - I am trying to add a secondary IP address to a VE interface
>> configured as such :
>>
>>  
>>
>> !
>> vlan 30
>>  tagged ethe 1/1
>>  router-interface ve 30
>> !
>> interface ve 30
>>  ip address 213.213.213.1/24
>> !
>>
>>  
>>
>> No I go and try to add a secondary address :
>>
>>  
>>
>> _ip_ <mailto:SSH at vanc-uk-lo-gwp-01-fb-cs-02%28config-vif-30%29%23ip>
>> add 13.213.213.1 255.255.255.0 secondary
>>
>>  
>>
>> and get the following error -
>>
>> IP/Port: Errno(11) Assign primary ip address on specified subnet first
>>
>>  
>>
>> I already have a primary address on the interface... so why wont it
>> accept this ? Appologies if I'm having a blonde moment.. any ideas ??
>
>
> On a Foundry the term "secondary ip address" refers to a second IP
> address on the SAME SUBNET as the primary address. Very different from
> the Cisco definition.
>
> To put a second IP on a different subnet, simply specify another "ip
> address" clause without the "secondary" keyword, and it should work fine.
>
> /cvk
>
>
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