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New Member

CSS11500 Bridge mode


It is possible to configure the CSS11500 on Bridge mode. We want to remove old LD430 and we need no address changes.

Some examples??



Re: CSS11500 Bridge mode

New Member

Re: CSS11500 Bridge mode

Thanks for the quick response!!

I've seen other posts in the Forum.

It's ok to me with this info...


Re: CSS11500 Bridge mode

first of all

CSS handles bridged packets in software, unless absolutely necessary, you should avoid configuring your CSS in bridge mode. Instead, you should configure your CSS in router mode, where packets are processed in hardware. Alternatively, the CSM handles both bridge- and router-mode traffic in hardware.

Bridge-Mode CSS Configuration

!************************* INTERFACE *************************

interface e1

bridge vlan 10

interface e2

bridge vlan 10

interface e3

bridge vlan 10

!************************** SERVICE **************************

circuit VLAN 10

ip address

service web01

ip address


service web02

ip address


!*************************** OWNER ***************************

owner cisco

content http-vip

vip address

protocol tcp

port 80

add service web01

add service web02


You must configure the default gateway of your servers as the IP address of the Layer 3

source is cisco press

good luck

please, Rate if helpful

New Member

Re: CSS11500 Bridge mode

Hi Marwan

Thanks for your help.

Where we found a reference about your comments? Any link or Cisco Document?

How big the traffic through the bridge can be? There are any limits?

We have a pair of CSS11503...


Re: CSS11500 Bridge mode

I am afraid this is not correct...

The 1st generation 11000 series CSS was limted in a one armed design because FCB's (flow

control blocks) were allocated on a per port basis on a 11000 series switch. Since you are

only using one port, you only have the resourced allocated to that port.

CSS 11500 series is not adversly impacted if you have a one armed load

balancing design because the 11500 distibutes FCBs over all ports.

For details about CSS 11500 Series architecture



New Member

Re: CSS11500 Bridge mode

Hello Syed:

Very interesting information.

In general, I can't found any reference about some danger for CSS11500 bridge mode.

I think that we will configure the CSS in that way...We will using the GbEth ports on SCM for "in line" (bridge) connection.

Thanks for your help!!

Re: CSS11500 Bridge mode


about the source it is good book if u can get it

cisco press, Content Networking Fundamentals, 2006

and the information i have given from there

CSS 11503 Supports one SCM, and any two of the I/O, SAM or SSL modules. Only a single switch fabric and power supply is available in the CSS 11503. Each module has 1.6 Gbps connectivity to the switch fabric, resulting in 10 Gbps aggregate throughput

Maximum Gigabit Ethernet Ports 6 (includes 2 on the SCM)

Redundancy Features · Active-active Layer 5 Adaptive Session Redundancy

· VIP redundancy

Bandwidth Aggregate 20 Gbps

Storage Options 512-MB hard disk or 256-MB flash memory disk

Power Integrated AC or DC

Default Hardware Switch Control Module with 2 Gigabit Ethernet (GBIC) Ports

# of Available Modules 3

Maximum 2-port Gigabit Ethernet I/O Module 2

those detail all about CSS 11503

good luck

please, Rate if helpful

New Member

Re: CSS11500 Bridge mode

Marwan, Thanks for your help and time.

But is more difficult for us to make any change on current network configuration...



Re: CSS11500 Bridge mode

its ok just for ur knowledge

and thanks for rating

by the way

have u read about cisco ACE loadbalancer

so nice try to find about it

Re: CSS11500 Bridge mode

Bridge-mode enables you to configure your VIPs on the same subnet as your real servers, whereas in router-mode your VIPs and serverfarm subnets must be different.

The CSS Load Balancer has a built-in switch fabric with multiple Ethernet ports that can be configured for multiple VLANs depending upon whether the CSS is configured for Bridging or Routing mode. If the CSS is configured in Bridging (Layer 2) mode, then all the Ethernet ports are configured in the same VLAN. The advantage of setting it in Layer 2 mode is that no network level changes are required. This means that you don't need to modify any IP addressing or change default gateway settings in your network. The CSS fits transparently into your network.

In Routing (Layer 3) mode, the CSS is configured with two VLANs. Your internal router needs to be configured to use the CSS as its default gateway. Similarly, the Internet router will have the CSS interface as the next hop to reach the corporate network. This requires you to modify some of the settings in your network. If configured in Routing mode, one VLAN connects to the internal network and the other VLAN connects to the iPrisms and the external router, which connects to the Internet.

see configuration example below:

New Member

Re: CSS11500 Bridge mode

Sachin, thanks for your help an references

We will use the Bridge Mode for this...