Brocade Communications Systems ServerIron ADX 12.4.00a - Manual (Page 19)

ServerIron ADX Security Guide 5
53-1002440-03
Prioritizing management traffic
1
By default, when ServerIron ADX receives TCP packet that is destined to VIP and there is no session
match then it sends TCP reset to the sender. However, if one desires to remain passive then the
above feature can be enabled.
To not send the reset packet, use the following command.
ServerIronADX(config)# server reset-on-syn-only
To remove the configuration, use the following command.
ServerIronADX(config)# no server reset-on-syn-only
Syntax: [no] server reset-on-syn-only
Prioritizing management traffic
ServerIron ADX software allows the system to prioritize traffic destined to the management IP
address in order to facilitate uninterrupted access to the ServerIron switch even under heavy load
conditions. This feature allows you to prioritize management traffic based on the following.
1. Client IP address/subnet
2. Protocol (TCP/UDP/IP) and
3. TCP or UDP port number
With this feature turned on, the specified traffic is directly forwarded to the Management Module in
hardware. In the following example, traffic from the source subnet 1.1.1.1 and destined to
management IP 10.45.16.104 for TCP port 22 (SSH) is prioritized.
ServerIronADX(config)# server prioritize-mgmt-traffic 1.1.1.1 255.255.255.0
10.45.16.104 6 22
Syntax: server prioritize-mgmt-traffic <source ip> <mask> <destination ip> [<protocol>] [<port>]
The <source ip> variable specifies the Source IP address.
The <mask> variable specifies the Mask for the source IP address.
The <destination ip> variable specifies the Destination management IP address. The destination IP
address must already be configured on the ServerIron ADX. If the IP address is not configured, the
command is rejected.
The <protocol> variable specifies any protocol.
The <port> variable specifies a TCP or UDP port.
It is also possible to prioritize management traffic from any source ip as shown in the example
below.
ServerIronADX(config)# server prioritize-mgmt-traffic any 10.45.16.104 6 22
Syntax: [no] server prioritize-mgmt-traffic any <destination ip> [<protocol>] [<port>]
NOTE
The prioritizing management traffic feature should not be enabled for a ServerIron ADX router VE
address if this interface is used for source-NAT as that would break the SLB traffic flow.
Refer to the following examples.
Prioritization of TCP port 80 traffic to management IP 200.1.1.1