Cisco Cisco IOS Software Release 12.0(21)S
GRE Tunneling on Cisco 12000 Series Internet Routers
Supported Platforms
5
Cisco IOS Release 12.0(21)S
Benefits
Router Performance
GRE tunneling on an E2 POS tunnel server card provides an aggregate throughput of approximately 2.7 Mpps
of tunnel traffic. Also, ingress and egress line cards can run any feature loads that a customer requires.
of tunnel traffic. Also, ingress and egress line cards can run any feature loads that a customer requires.
Restrictions
Performance of Other Tunnel Protocols Impacted
GRE tunneling does not impact the performance of the normal IP forwarding path on the Cisco 12000
series Internet router. The performance of other IP tunnel protocols (UTI raw, FR UTI, and so on) is,
however, affected if they run at the same time because they share the bandwidth that is available on the
tunnel server card. A maximum of 2.7 Mpps of traffic is supported on the tunnel server card.
series Internet router. The performance of other IP tunnel protocols (UTI raw, FR UTI, and so on) is,
however, affected if they run at the same time because they share the bandwidth that is available on the
tunnel server card. A maximum of 2.7 Mpps of traffic is supported on the tunnel server card.
Scalability
•
You can specify a maximum of 128 unique IP interfaces as GRE tunnel sources on a Cisco 12000
series Internet router.
series Internet router.
•
Each unique GRE bound IP interface can have a maximum of 500 tunnels destined to it.
•
The Cisco 12000 series Internet router supports up to a maximum of 500 GRE tunnels.
Related Features and Technologies
•
Cisco Express Forwarding (CEF)
Related Documents
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Cisco IOS Release 12.0 Configuration Fundamentals Configuration Guide
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Cisco IOS Release 12.0 Configuration Fundamentals Command Reference
•
Cisco Express Forwarding Overview
•
Configuring Cisco Express Forwarding
•
Cisco IOS IP and IP Routing Configuration Guide
Supported Platforms
On a Cisco 12000 series Internet router, the following line cards support GRE tunneling on
customer-facing interfaces:
customer-facing interfaces:
•
Engine 0
–
1-Port OC-12 POS
–
2-Port Channelized OC-3/STM-1 (DS1/E1)
–
6-Port Channelized T3 (T1)