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Implementing Secure Converged Wide Area Networks (ISCW)

Implementing Secure Converged Wide Area Networks (ISCW). Module 4: Frame Mode MPLS Implementation . Module 4: Frame Mode MPLS Implementation . Lesson 4.3: Implementing Frame Mode MPLS. Objectives. Describe the steps required to configure MPLS.

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Implementing Secure Converged Wide Area Networks (ISCW)

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  1. Implementing Secure Converged Wide Area Networks (ISCW) Module 4: Frame Mode MPLS Implementation

  2. Module 4: Frame Mode MPLS Implementation Lesson 4.3: Implementing Frame Mode MPLS

  3. Objectives • Describe the steps required to configure MPLS. • Identify the distribution protocol options when configuring MPLS.

  4. The Procedure to Configure MPLS • Configure CEF. • Configure MPLS on a frame mode interface. • (Optional) Configure the MTU size in label switching.

  5. Step 1: Configure CEF • To enable MPLS, you must first configure CEF: • Configure CEF: • Enable CEF switching to create the FIB table. • Enable CEF switching on all core interfaces. • Configure MPLS on a frame mode interface. • (Optional) Configure the MTU size in label switching.

  6. Commands for Configuring CEF • Starts CEF switching and creates the FIB table • The distributed keyword configures distributed CEF (running on VIP or line cards) • All CEF-capable interfaces run CEF switching Router(config)# ip cef [distributed] Router(config-if)# ip route-cache cef • Enables CEF switching on an interface • Usually not needed

  7. Using the ip cef [distributed] Parameter • The optional [distributed] parameter enables dCEF. This distributes the CEF information to the line cards and the line cards perform express forwarding. • Consider the following: • CEF is enabled by default only on these platforms: • Cisco 7100 series router • Cisco 7200 series router • Cisco 7500 series Internet router • Distributed CEF is enabled on the Cisco 6500 series router. • Distributed CEF is enabled on the Cisco 12000 series Internet router.

  8. Monitoring IP CEF • Displays a summary of the FIB Router# show ip cef detail Router#show ip cef detailIP CEF with switching (Table Version 6), flags=0x0 6 routes, 0 reresolve, 0 unresolved (0 old, 0 new) 9 leaves, 11 nodes, 12556 bytes, 9 inserts, 0 invalidations 0 load sharing elements, 0 bytes, 0 references 2 CEF resets, 0 revisions of existing leaves refcounts: 543 leaf, 544 node Adjacency Table has 4 adjacencies 0.0.0.0/32, version 0, receive 192.168.3.1/32, version 3, cached adjacency to Serial0/0.10 0 packets, 0 bytes tag information set local tag: 28 fast tag rewrite with Se0/0.10, point2point, tags imposed: {28} via 192.168.3.10, Serial0/0.10, 0 dependencies next hop 192.168.3.10, Serial0/0.10 valid cached adjacency tag rewrite with Se0/0.10, point2point, tags imposed: {28}

  9. Using show ip cef Parameters

  10. Step 2: Configure MPLS on Frame Mode Interface • Configure CEF. • Configure MPLS on a frame mode interface: • Enable label switching on a frame mode interface. • Start LDP or TDP label distribution protocol. • (Optional) Configure the MTU size in label switching.

  11. Commands for Configuring MPLS on a Frame Mode Interface • Enables label switching on a frame mode interface • Starts LDP on the interface Router(config-if)# mpls ip Router(config-if)# mpls label protocol [tdp | ldp | both] • Starts selected label distribution protocol on the specified interface

  12. Configuring MPLS on a Frame Mode Interface: Example 1

  13. Configuring MPLS on a Frame Mode Interface: Example 2

  14. Step 3: Configure the MTU Size in Label Switching • Configure CEF. • Configure MPLS on a frame mode interface. • Configure the MTU size in label switching: • Increase MTU on LAN interfaces.

  15. Commands for Configuring MTU Size • Label switching increases the MTU requirements on an interface because of additional label header. • Interface MTU is automatically increased on WAN interfaces; IP MTU is automatically decreased on LAN interfaces. • Label-switching MTU can be increased on LAN interfaces (resulting in jumbo frames) to prevent IP fragmentation. Router(config-if)# mpls mtu bytes

  16. Configuring Label Switching MTU

  17. Summary • There are three steps to configuring an MPLS: • Configure CEF:. • Configure MPLS on a frame mode interface. • Configure the maximum transmission unit (MTU) size in label switching. • To enable MPLS, you must first enable CEF switching. CEF switching is commonly enabled globally on a router. However, it can also be enabled on individual interfaces. • You can display entries in the FIB or display a summary of the FIB with the show ip cef command. • Cisco routers can use one or both of two protocols for distribution: • Tag Distribution Protocol (TDP) • Label Distribution Protocol (LDP)

  18. Q and A

  19. Resources • Multiprotocol Label Switching (MPLS) • http://www.cisco.com/en/US/partner/tech/tk436/tsd_technology_support_category_home.html

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