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https://www.gigamon.com/products/optimize-traffic/traffic-intelligence/gigasmart/tunneling-erspan-termination.html

 

Remote Traffic Tunneling | ERSPAN Termination | GigaSMART | Gigamon

GigaSMART® Tunneling helps alleviate blindness of business-critical traffic at remote sites, virtualized data centers or hosted in a public cloud.

www.gigamon.com

Extend monitoring to remote sites and the cloud

The Tunneling feature is a licensable addition to the GigaSMART® engine that helps alleviate blindness of business-critical traffic at remote sites, virtualized data centers, or hosted in a public cloud. Tunneling is used in conjunction with Flow Mapping® technology to select traffic at remote sites that should be subject to additional inspection. That traffic subset can then be forwarded via IP/UDP or L2GRE encapsulation to centralized monitoring and security resources. Tunneling also works with GigaVUE-VM for VMware, GigaVUE-VM for OpenStack, and Visibility Platform for AWS to select and tunnel traffic from within virtual environments to the Gigamon® Visibility Platform via L2GRE tunnels. With Tunneling, physical networks can utilize cloud-based tools and load balance across multiple instances.

Benefits of the Tunneling feature

  • Provides security teams with access to suspicious traffic anywhere within the organization, local or remote, physical or virtual.
  • Eliminates the cost of deploying and managing tools at branch offices and remote sites.
  • Preserves the processing power of hypervisors to handle workload, instead of management and monitoring.
  • Immediately extends monitoring and security to new acquisitions or temporary installations until other arrangements can be made.
  • Enables load balancing across multiple IP-addressable virtual and cloud-based tools.
  • Allows operators to take advantage of existing Cisco NEXUS features by forwarding traffic via ERSPAN tunnels to the Gigamon Visibility Platform.

 

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GigaSMART ERSPAN Tunnel Decapsulation
Some Cisco equipment provides the ability to mirror monitored traffic to a remote destination through an ERSPAN tunnel. Using ERSPAN tunnel decapsulation, GigaSMART can act as the receiving end of an ERSPAN tunnel, decapsulating mirrored traffic sent over the Internet from a Cisco switch or router.

ERSPAN Tunnel Header Removal Example
In this example, a tunnel is configured to capture ERSPAN packets, then the ERSPAN header is removed and the packets are forwarded to a tool port.

 

Step

Description

Command

1.    
Configure a tool type of port.

(config) # port 1/1/g1 type tool

2.  
Configure a GigaSMART group and associate it with a GigaSMART engine port.

(config) # gsgroup alias gsgp1 port-list 1/3/e1

3.  
Configure the IP interface.

(config) # ip interface alias test

(config ip interface alias test) # attach 1/1/g1

(config ip interface alias test) # ip address 10.10.10.10 /29

(config ip interface alias test) # gw 10.10.10.1

(config ip interface alias test) # mtu 9400

(config ip interface alias test) # gsgroup add gsgp1

(config ip interface alias test) # exit

4.  
Configure the GigaSMART operation and assign it to the GigaSMART group.

Note: A flow ID of zero is a wildcard value that matches all flow IDs.

(config) # gsop alias er1 tunnel-decap type erspan flow-id 0 port-list gsgp1

5.  
Create a map.

(config) # map alias ermap
(config map alias ermap) # type regular byRule
(config map alias ermap) # use gsop er1
(config map alias ermap) # rule add pass protocol gre
(config map alias ermap) # from 1/1/g2
(config map alias ermap) # to 1/1/g1
(config map alias ermap) # exit
(config) #

6.  
Display the configuration for this example.

(config) # show gsgroup
(config) # show gsop
(config) # show ip interfaces
(config) # show map

ERSPAN Type III Tunnel Header Removal Example
In this example, a tunnel is configured to capture ERSPAN packets. ERSPAN Type III packets are parsed, the ERSPAN header is removed, and the timestamp is calculated. A timestamp trailer is added before the packets are forwarded to a tool port.

 

Step

Description

Command

1.    
Configure a tool type of port.

(config) # port 1/1/g1 type tool

2.  
Configure a GigaSMART group and associate it with a GigaSMART engine port.

(config) # gsgroup alias gsgp1 port-list 1/3/e1

3.  
Configure the IP interface.

(config) # ip interface alias test

(config ip interface alias test) # attach 1/1/g1

(config ip interface alias test) # ip address 10.10.10.10 /29

(config ip interface alias test) # gw 10.10.10.1

(config ip interface alias test) # mtu 9400

(config ip interface alias test) # gsgroup add gsgp1

((config ip interface alias test) # exit

4.  
Configure the GigaSMART operation and assign it to the GigaSMART group.

Note: A flow ID of zero is a wildcard value that matches all flow IDs.

(config) # gsop alias gsop_erspan tunnel-decap type erspan flow-id 0 port-list gsgp1

5.  
Configure a timestamp trailer format.

(config) # gsparams gsgroup gsgp1 erspan3-timestamp format gs

6.  
Create a map. The map contains a rule to allow marker packets (UDP) to be processed.

(config) # map alias ermap
(config map alias ermap) # type regular byRule
(config map alias ermap) # use gsop gsop_erspan
(config map alias ermap) # rule add pass protocol gre
(config map alias ermap) # rule add pass protocol udp
(config map alias ermap) # from 1/1/g2
(config map alias ermap) # to 1/1/g1
(config map alias ermap) # exit
(config) #

7.  
View the the ERSPAN III timestamp

(config) # show gsparams
8.  
View the ERSPAN statistics.

(config) # show gsop stats alias gsop_erspan
Refer to the “ERSPAN Statistics Definitions” section and to the “GigaSMART Operations Statistics Definitions” in the GigaVUE-FM User’s Guide for details.

 

 

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