Port Mirroring with Greenspan

The mirroring features allow the mirroring of source port packets in Rx and Tx in both directions to a local destination port. Mirroring with the Greenspan feature allows the mirroring of source packets in the Rx direction onto the GRE tunnel.

Configuring Mirroring with Greenspan and Port

These commands configure a mirroring session with a destination for the GRE tunnel interface and regular port.

Syntax

// Source port

router(config)# monitor session <name> source <interface> [ rx | tx | both ] [ ip access-group <access-list-name>

 

// GREENSPAN destination

router(config)# monitor session <name> destination tunnel mode gre source <ipAddress> destination <ipAddress> ttl <ttlValue> dscp <dscpValue>

 

// Port destination

router(config)# monitor session <name> destination <interface>

 

Example:

router(config)# monitor session r1 source Ethernet2 rx ip access-group a3
router(config)# monitor session r1 destination tunnel mode gre source 75.75.75.75 destination 100.1.0.2

 

Displaying Mirroring with Greenspan and Port Information

These two commands display the monitor and platform-related mirroring information.
  • show monitor session
  • show platform sfe mirroring

Examples:

The show monitor session command displays the session information. 
router# show monitor session

Session r1
------------------------

Programmed in HW: Yes

Source Ports:

Rx Only: Et2(IPv4 ACL: a3)

Destination Ports:

statussource dest TTLDSCP protoVRF fwd-drop
Gre1 :active5.75.75.75 100.1.0.2 12800x88be default no
next hop interfaces: Et5

 

The show platform sfe mirroring command displays the platform-specific SFE mirroring information. 
router# show platform sfe mirroring
Session: r1, mirrorGroup: 3, globalId: 0
 srcIntf: Ethernet2, direction: Rx
 tgtIntf: Gre1
encapType: Gre
 Sfe module: Mir_r1_Rx_et2
Sfe srcIntf: Ethernet2, direction: Rx, gate: 0
Sfe tgtIntf: Ethernet5, gate: 1
Copy Success: 47523752, Fail: 0
Forward Success: 53109025, Fail: 0