10-05-2018 03:56 AM
Hello,
We are running out of IP Addresses in our DHCP scope, so I have been tasked with sorting this out. One possible solution we are considering is to setup a second scope and use Superscoping.
Our main IP range is 192.168.0.0/24 and we would like to use 192.168.1.0/24 for the next range.
We use Cisco Switches Catalyst 2960 which are Gb devices and Juniper SRX firewalls. We also have a layer 3 switch a Catalyst 3650, which we are using for test purposes.
On the layer 3 switch, I created 2 vLans for the 2 different IP ranges and can successfully get traffic flowing between the 2 networks. I have also created address book entries on the Juniper firewall and set a trust to trust policy to handle the routing.
As a test, I have been copying a 4GB file between devices on the same IP range and also between the 2 networks.
Typically, the file will transfer in about 40 seconds at speeds of 100MB/sec between devices on the same network. However, when copying this file between the 2 networks then I get a massive reduction in transfer speed.
The cisco layer 3 switch gets a transfer rate of around 20MB/sec and when using the Juniper device instead I get a speed of 10MB/sec.
If I connect my test clients directly to the layer 3 switch then I get a transfer speed of 100MB/sec which is what I would expect. However, when I connect the clients to a normal switch which in turn gets connected to the layer 3 switch, then my transfer speed drops to 20MB/sec
All ports are set to their full speed of 1Gb.
Is Superscoping not a good idea. We really do not want to change to a /23 subnet, but it looks like this might be our next option if I cannot get the routing between 2 networks to work at an acceptable speed. Bearing in mind that this is only a test setup so there is no traffic on the network, apart from the 2 test clients
10-05-2018 04:05 AM
Hello,
post the full config of your 3650...
10-05-2018 05:11 AM
Hi, please see below. Hope this is what you are after:
10-05-2018 06:01 AM - edited 10-05-2018 06:04 AM
Hello,
Is this the full configuration ,? There should be lines such as ip routing and ip cef in there...
Can you post the output os:
Show interfaces gigabitethernet1/0/2 ,and 1/0/3 ?
10-05-2018 06:25 AM
So this is what show interfaces gigabitEthernet 1/0/3 and 1/0/2 shows:
10-05-2018 06:33 AM
Heelo,
Post the output of the two active interfaces between which the file transfer is slow...
10-05-2018 06:45 AM - edited 10-05-2018 06:49 AM
superscoping is a way to use multiple IP subnets on the same LAN (/VLAN) within the LAN it's L2 forwarding.
you need a router with multiple interfaces connected to the same LAN to forward packets between the subnets.
nowadays it is more common to assign each subnet to its own VLAN,
and use a router (L3 switch) with an interface/subinterface/SVI per VLAN to forward packets between the subnets.
that's why Georg (expects some L3 config)
with separate vlans you do not need superscoping just two separate scopes
10-05-2018 06:51 AM
I have tried both ways. Using Juniper SRX340 to do the routing then I get transfer speeds of 10MB/Sec. Using a Cisco L3 switch, I created 2 vlans for each subnet and get transfer speeds of 20MB/sec.
Using both solutions when transferring data to clients on the same network I get 100MB/sec.
10-05-2018 06:58 AM
I see no "ip routing" statement in your switchconfig,
and "no ip route 0.0.0.0 0.0.0.0 <Juniper> "
so its layer3 capable but not acting as layer3 switch
10-05-2018 07:07 AM
Juniper will not show in this config. Sorry if I'm causing confusion. I have setup 2 different tests 1 using Juniper to do the routing and 1 using a L3 switch. For Juniper I added 192.168.0.1 and 192.168.1.1 to the address book and setup a policy for zone trust to trust. Again, each client can ping each other but get awful file transfer speeds
I have not setup any IP Routing on the L3 switch, is this where I am going wrong. All I did was create 2 vlans, 1 for 192.168.0.0/24 and 1 for 192.168.1.0/24
I have one client IP 192.168.1.20 and another set to 192.168.0.20. They can both ping each other using the config I have
But my transfer speeds are slow when copying a 4 GB
10-05-2018 07:10 AM
Hi Georg, Sorry I posted that config when I did not have any devices connected to the switch. I have re-setup the test again:
10-05-2018 07:13 AM
One thing I think I might have forgotten to mention. If I connect the clients directly to the L3 switch, then transferring a file across the 2 vLans I get 100MB/sec.
But this is not a valid test as all clients will connect to a L2 switch which in turn would connect to the L3 one. When I set this up, that is when I get the slow transfer speed
10-05-2018 07:22 AM
Did you verify everything connects at 1Gbps?
10-05-2018 07:18 AM
10-05-2018 07:23 AM
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