Cisco IPS-4255-K9 - Intrusion Protection Sys 4255 Installation Manual page 29

Chapter 1 Introducing the Sensor
Inline Interface Pairs
•
–
–
–
–
–
–
Inline VLAN Pairs
•
–
–
–
–
–
Alternate TCP Reset Interface
•
–
–
–
–
–
–
• VLAN Groups
–
–
–
OL-18504-01
Inline interface pairs can contain any combination of sensing interfaces regardless of the
physical interface type (copper versus fiber), speed, or duplex settings of the interface.
However, pairing interfaces of different media type, speeds, and duplex settings may not be
fully tested or supported.
The command and control interface cannot be a member of an inline interface pair.
You cannot pair a physical interface with itself in an inline interface pair.
A physical interface can be a member of only one inline interface pair.
You can only configure bypass mode and create inline interface pairs on sensor platforms that
support inline mode.
A physical interface cannot be a member of an inline interface pair unless the subinterface mode
of the physical interface is none.
You cannot pair a VLAN with itself.
You cannot use the default VLAN as one of the paired VLANs in an inline VLAN pair.
For a given sensing interface, a VLAN can be a member of only one inline VLAN pair.
However, a given VLAN can be a member of an inline VLAN pair on more than one sensing
interface.
The order in which you specify the VLANs in an inline VLAN pair is not significant.
A sensing interface in inline VLAN pair mode can have from 1 to 255 inline VLAN pairs.
You can only assign the alternate TCP reset interface to a sensing interface. You cannot
configure the command and control interface as an alternate TCP reset interface. The alternate
TCP reset interface option is set to none as the default and is protected for all interfaces except
the sensing interfaces.
You can assign the same physical interface as an alternate TCP reset interface for multiple
sensing interfaces.
A physical interface can serve as both a sensing interface and an alternate TCP reset interface.
The command and control interface cannot serve as the alternate TCP reset interface for a
sensing interface.
A sensing interface cannot serve as its own alternate TCP reset interface.
You can only configure interfaces that are capable of TCP resets as alternate TCP reset
interfaces.
The exception to this restriction is the IDSM2. The alternate TCP reset interface
Note
assignments for both sensing interfaces is System0/1 (protected).
You can configure any single interface for promiscuous, inline interface pair, or inline VLAN
pair mode, but no combination of these modes is allowed.
You cannot add a VLAN to more than one group on each interface.
You cannot add a VLAN group to multiple virtual sensors.
Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.0
How the Sensor Functions
1-11