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How can I suitable handle a bunch of colocation (server) customers, all with
their own /30 transfernets and vlans in consideration of that the only SPOF
should be the _first_ switch they are connected to. Possible setup without
L2 redundancy:


<-------------------------- CUSTOMER-IP's | CORE-IP's---------->
NO REDUNDANCY | L3 IGP(OSPF) REDUNDANCY
================================================== ==============
+-----+
CUST1---VL1-----|L2-SW|
CUST2---VL2-----| 1 |
CUST3---VL3-----| | lnk1 +----------+
... | |---TRUNK1-----|L3-COLO-GW|--->IP-100/UPLINK1-->
+-----+ | |
+---| |--->IP-101/UPLINK2-->
+-----+ | +----------+
CUST11---VL11---|L2-SW| | VL1/IP-1
CUST12---VL12---| 2 | | VL2/IP-2
CUST13---VL13---| | lnk2 | VL3/IP-3
... | |---TRUNK2-+ VL11/IP-11
+-----+ ...


Is a L2-redundancy/HSRP setup towards the customer with a second L3-COLO-GW
(4908G-L3) in this situation possible? Thx for any hints to my brain

-Gerald

Gerald Krause wrote:

> How can I suitable handle a bunch of colocation (server) customers, all with
> their own /30 transfernets and vlans in consideration of that the only SPOF
> should be the _first_ switch they are connected to. Possible setup without
> L2 redundancy:
>
>
> <-------------------------- CUSTOMER-IP's | CORE-IP's---------->
> NO REDUNDANCY | L3 IGP(OSPF) REDUNDANCY
> ================================================== ==============
> +-----+
> CUST1---VL1-----|L2-SW|
> CUST2---VL2-----| 1 |
> CUST3---VL3-----| | lnk1 +----------+
> ... | |---TRUNK1-----|L3-COLO-GW|--->IP-100/UPLINK1-->
> +-----+ | |
> +---| |--->IP-101/UPLINK2-->
> +-----+ | +----------+
> CUST11---VL11---|L2-SW| | VL1/IP-1
> CUST12---VL12---| 2 | | VL2/IP-2
> CUST13---VL13---| | lnk2 | VL3/IP-3
> ... | |---TRUNK2-+ VL11/IP-11
> +-----+ ...
>
>
> Is a L2-redundancy/HSRP setup towards the customer with a second L3-COLO-GW
> (4908G-L3) in this situation possible? Thx for any hints to my brain
>
> -Gerald

Yes, but you'll need to do it for each vlan on the l3-colo-gw's and
ensure they can see each other at layer 2. Easier to manage if you can
trunk the l2's together and let PVST do it's thing.

Mark Lar wrote:

> Gerald Krause wrote:
>
>> How can I suitable handle a bunch of colocation (server) customers, all
>> with their own /30 transfernets and vlans in consideration of that the
>> only SPOF should be the _first_ switch they are connected to. Possible
>> setup without L2 redundancy:
>>
>>
>> <-------------------------- CUSTOMER-IP's | CORE-IP's---------->
>> NO REDUNDANCY | L3 IGP(OSPF) REDUNDANCY
>> ================================================== ==============
>> +-----+
>> CUST1---VL1-----|L2-SW|
>> CUST2---VL2-----| 1 |
>> CUST3---VL3-----| | lnk1 +----------+
>> ... | |---TRUNK1-----|L3-COLO-GW|--->IP-100/UPLINK1-->
>> +-----+ | |
>> +---| |--->IP-101/UPLINK2-->
>> +-----+ | +----------+
>> CUST11---VL11---|L2-SW| | VL1/IP-1
>> CUST12---VL12---| 2 | | VL2/IP-2
>> CUST13---VL13---| | lnk2 | VL3/IP-3
>> ... | |---TRUNK2-+ VL11/IP-11
>> +-----+ ...
>>
>>
>> Is a L2-redundancy/HSRP setup towards the customer with a second
>> L3-COLO-GW (4908G-L3) in this situation possible? Thx for any hints to my
>> brain
>>
>> -Gerald
>
> Yes, but you'll need to do it for each vlan on the l3-colo-gw's and
> ensure they can see each other at layer 2.

I thought a distinct HSRP instance for each customer/vlan is something I can
not deploy because most of them have a /30 transfernet (HSRP = at least 6
IP's? customer, gw1, gw2, virtual, net, broadcast). Furthermore I'am afraid
concerning the max count of HSRP instances per L3 system when thinking
about ~100..200 customers/vlans.

> Easier to manage if you can
> trunk the l2's together and let PVST do it's thing.

Ok, sounds interesting - what did that mean? I've searched for some
reference designs but all I found is HSRP for such 'dummy' servers.


-Gerald