Debugging MPLS and LDP

* Debugs TDP adjacencies, session establishment, and label bindings exchange * Debugs LFIB events label creations, removals, rewrite and so on * Debugs labeled packets switched by the router 2003, Chco Systems, Inc. All rights reserved. MPLS v20-3-15 A large number of debug commands are associated with MPLS on Cisco IOS platforms. The debug mpls ldp set of commands debug various aspects of LDP protocol, from label distribution to exchange of the application-layer data between adjacent...

Show ip route vrf

To display the IP routing table associated with a VRF, use the show ip route vrf command in EXEC mode show ip route vrf vrf-name connected protocol as-number tag output-modifiers list number output-modifiers profile static output-modifiers summary output-modifiers supernets-only output-modifiers traffic-engineering output-modifiers (Optional) Displays all connected routes in a VRF. (Optional) To specify a routing protocol, use one of the following keywords bgp, egp, eigrp, hello, igrp, is is,...

The show ip cef command can also display the label stack associated with the Mpibgp route

All rights reserved. To display the CEF forwarding table associated with a VRF, use the show ip cef vrf command in privileged EXEC mode show ip cef vrf vrf-name ip-prefix mask longer-prefixes detail output-modifiers interface interface-number adjacency interface interface-number detail discard drop glean null punt output-modifiers detail output-modifiers non-recursive detail output-modifiers summary output-modifiers traffic prefix-length output-modifiers unresolved...

Configuring a Label Switching MTU

Hmrni min mini mini mini min mini m to Label switching increases the maximum 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. The jumbo frames are not supported by all LAN switches. 2003, Cisco Systems, Inc. All right* reserved. MPLS v2.0-3-9 To set the...

Monitoring an Mpbgp Vpnv4 Table

* Displays only BGP parameters (routes or neighbors) associated with specified VRF. * Any BGP show command can be used with these parameters. * Displays only BGP parameters (routes or neighbors) associated with specified RD. 2003, Ctaco System*, Inc. All right* reserved. MPLS V2.0-S-I5 The show ip bgp vpnv4 command displays IPv4 BGP information as well as VPNv4 BGP information. To display VPNv4 BGP information, use one of these keywords all to display the whole contents of the VPNv4 BGP table...

VPN Label Propagation

Question How will the ingress PE router get the second label in the label stack from the egress PE router Question How will the ingress PE router get the second label in the label stack from the egress PE router Answer Labels are propagated in MP-BGP VPNv4 routing updates. W 2003, Cisco System , Inc. All right reserved. The previous figures showed that an MPLS label stack with the second label is required for proper MPLS VPN operation. This label was allocated by the egress PE router. This...

PE routers never redistribute OSPF routes with down bit set into MPBGP

All rights move* MPLS v20-5-31 Two mechanisms were introduced to prevent route redistribution loops between OSPF (running between PE and CE routers) and MP-BGP running between PE routers BGP Site of Origin (SOO), which is covered in the MPLS VPN Routing Model lesson of the MPLS Virtual Private Networks Technology module and detailed further in the Configuring BGP as the Routing Protocol Between PE and CE Routers lesson of the MPLS VPN Implementation module The down...

Only RIPv2 is supported

All right* reserved. MPLS v20-7-7 Configuring RIP as the PE-CE routing protocol is even easier than configuring BGP. Start the configuration of individual routing context with the address-family ipv4 vrf vrf-name command in router configuration mode. You can enter all standard RIP parameters in the per-VRF routing context. Global RIP parameters entered in the scope of RIP router configuration are inherited by each routing context and can be overwritten if needed in...

Is CEF enabled on the ingress PE router interface

MPLS VPN needs CEF enabled on the ingress PE router interface for proper operation. CEF might become disabled because of additional features deployed on the interface. W 2003, Cisco System , Inc. All right reserved One of the most common configuration mistakes related to data flow is the failure to enable CEF in the ingress PE router interface. The presence of CEF can be verified with the show cef interface command. CEF is the only switching method that can...

Course Glossary

The Course Glossary for Implementing Cisco MPLS (MPLS) v2.0 highlights and defines key terms and acronyms used throughout this course. Many of these terms are also described in the Cisco Internetworking Terms and Acronyms resource, available via http www.cisco.com. access control list. A filter list kept by routers to control access to or from the router for a number of services (for example, to prevent packets with a certain IP address from leaving a particular interface on the router)....

Show ip bgp vpnv4

To display VPN address information from the BGP table, use the show ip bgp vpnv4 command in EXEC mode show ip bgp vpnv4 all rd route-distinguisher vrf vrf-name ip-prefix length longer-prefixes output-modifiers network-address mask longer-prefixes output-modifiers cidr-only community community-list dampened-paths filter-list flap-statistics inconsistent-as neighbors paths line peer-group quote-regexp regexp summary labels Displays the complete VPNv4 database. Displays Network Layer Reachability...

Pata Mpt Mpt group created on demand for mVPN SG pairs usually highbandwidth traffic

Cisco Mpls Mvpn Default Mdt Data Mdt

All rights reaefved MPLS v20- - VPN-aware multicast technology has introduced a new set of terminology. Multicast VPNs introduce multicast routing information to the VRF table. When a PE router receives multicast data or control packets from a CE router, forwarding is performed according to information in the multicast virtual routing and forwarding instance (MVRF). A set of MVRFs that can send multicast traffic to each other constitutes a multicast domain. For...

Maintains support for all existing applications and protocols in an MPLS vPn environment

All right* reserved. MPLS v20- -9 NAT can be implemented on the PE route in the following scenarios Service point Shared access can be from a generic interface or from a VPN interface. NAT point NAT can be configured on the PE router that is directly connected to the shared access gateway, or on the PE router that is not directly connected to the shared access gateway. NAT interface The shared access gateway interface is most often configured as the outside interface...

DHCP Relay Cont Shared DHCP Server

End station makes DHCP request DHCP relay agent adds VPN info Server assigns address based on option 82 data and replies W 2003, Cisco System , Inc. All right* reserved In this example, the corporate DHCP server has been replaced with a shared DHCP server provided by the service provider. Because the server is shared between VPNs, a NAT PE could also be included to provide address translation. The client broadcasts a DHCP request to the local relay. The local relay converts the broadcast to a...

OnDemand Address Pools Cont VRF Pool Example

All rights reserved. In this example, the PE router is configured as a DHCP server with ODAP, and a second router is configured to be a subnet allocation server for VNP A. On the PE router, a DHCP pool named A_pool has been created. This pool is associated with VPN A. Three new commands have been introduced to the DHCP command presented in the previous topic. To configure an address pool as an ODAP, use the origin command. The subnet size initial size option is used...