Technical Documentation

Monitoring BGP-Related Settings for VPWS L2VPNS

Purpose

This section provides examples of some of the show ip bgp commands that you can use to monitor VPWS configurations.

You can use the show ip bgp commands listed in Table 1 to display BGP-related settings for VPWS instances in the L2VPN address family. The l2vpn all keywords display both all VPWS instances and all VPLS instances in the L2VPN address family

Table 1: Commands for Monitoring BGP Settings for the VPWS Address Family

show ip bgp advertised-routes	show ip bgp neighbors received-routes
show ip bgp l2vpn all	show ip bgp neighbors routes
show ip bgp neighbors	show ip bgp peer-group
show ip bgp neighbors dampened-routes

You can use the show ip bgp commands listed in Table 2 to display BGP-related settings for L2VPNs. Specify l2vpn vpws vpwsName to display information about only the VPWS instances in the VPWS address family. Specify l2vpn all to display information about all VPWS instances in the VPWS address family and all VPLS instances in the VPLS address family.

Table 2: Commands for Monitoring BGP Settings for the VPWS Address Family

show ip bgp	show ip bgp l2vpn vpws
show ip bgp community	show ip bgp next-hops
show ip bgp community-list	show ip bgp paths
show ip bgp dampened-paths	show ip bgp quote-regexp
show ip bgp filter-list	show ip bgp regexp
show ip bgp flap-statistics	show ip bgp summary

For more information about using the show ip bgp commands that are not described in this section, see Unresolved xref and Unresolved xref.

Display layer 2 NLRI for all VPWS instances in the L2VPN address family, for a particular VPWS instance in the L2VPN address family, or for a particular VPWS instance in the VPWS address family.

The l2vpn vpws keywords display layer 2 NLRI for a particular VPWS instance in the VPWS address family.

The l2vpn all keywords display layer 2 NLRI for all VPWS instances in the L2VPN address family. The output for this version of the command also includes information about any VPLS instances configured in the L2VPN address family.

To display layer 2 NLRI for the route that matches a specified prefix (site ID and block offset) in the L2VPN address family or in the VPWS address family, use the site-id and block-offset keywords.

Action

To display information for a particular L2VPN instance in the L2VPN address family:

host1:pe1# show ip bgp l2vpn vpws l2vpn1
Local BGP identifier 10.1.1.1, local AS 100
  2 routes (152 bytes)
  2 destinations (152 bytes) of which 2 have a route
  2 routes selected for route tables installation
  0 unicast/multicast routes selected for route table installation
  0 unicast/multicast tunnel-usable routes selected for route table installation
  0 tunnel-only routes selected for tunnel-route table installation
  4 path attribute entries (608 bytes)
  Local-RIB version 6. FIB version 6.
Status codes: > best, * invalid, s suppressed, d dampened, r rejected,
              a auto-summarized m multihomed-backup
  Prefix      Peer            Next-hop         MED LocPrf Weight Origin
> 1:1         0.0.0.0         self                           0    IGP    
> 2:1         12.2.2.2        12.2.2.2              100      0    IGP

To display summary information for a particular VPWS instance in the VPWS address family; only the BGP operational state is useful:

host1:pe1# show ip bgp l2vpn vpws l2vpn1 summary
Local router ID 10.1.1.1, local AS 100
  Administrative state is Start
  BGP Operational state is Up
  Shutdown in overload state is disabled
  Default local preference is 100
  Default originate is disabled
  Always compare MED is disabled
  Compare MED within confederation is disabled
  Advertise inactive routes is disabled
  Advertise best external route to internal peers is disabled
  Enforce first AS is disabled
  Missing MED as worst is disabled
  Route flap dampening is disabled
  Log neighbor changes is disabled
  Fast External Fallover is disabled
  No maximum received AS-path length
  BGP administrative distances are 20 (ext), 200 (int), and 200 (local)
  Client-to-client reflection is enabled
  Cluster ID is not configured (local router ID used)
  Route-target filter is enabled
  Default IPv4-unicast is enabled
  Redistribution of iBGP routes is disabled
  Graceful restart is globally disabled
  Global graceful-restart restart time is 120 seconds
  Global graceful-restart stale paths time is 360 seconds
  Graceful-restart path selection defer time is 360 seconds
  Graceful-restart is not ready to switch to the standby SRP
  The last restart was not graceful
  Local-RIB version 6. FIB version 6.
  (No neighbors are configured)

To display information for the route that matches the specified prefix (2:1) for a VPWS instance named customer1 in the VPWS address family:

host1#show ip bgp l2vpn vpws customer1 site-id 2 block-offset 1

BGP route information for prefix 2:1
  Received route learned from internal peer 10.2.2.2 (best route)
    Leaked route
    Route placed in IP forwarding table
    Best to advertise to external peers
    Address Family Identifier (AFI) is layer2
    Subsequent Address Family Identifier (SAFI) is unicast
    Route Distinguisher (RD) is 100:11
    Original Route Distinguisher (RD) is 100:21
    MPLS in-label is none
    MPLS in-label block size is 0
    MPLS out-label is 46
    MPLS out-label block size is 20
    Next hop IP address is 2.2.2.2 (metric 3)
    Multi-exit discriminator is not present
    Local preference is 100
    Weight is 0
    Origin is IGP
    AS path is empty
    Extended communities RT:100:1 Layer 2:19:00:0

To display information for all instances that support a multihomed site with site ID 2 and block offset 1:

host1:pe1#show ip bgp l2vpn all site-id 2 block-offset 1
BGP route information for prefix 2:1
Received route learned from internal peer 2.2.2.2 (best route)
   Route not placed in PW table
   Best to advertise to external peers
   Suppressed by multihoming
   Address Family Identifier (AFI) is layer2
   Subsequent Address Family Identifier (SAFI) is vpn-unicast
   Route Distinguisher (RD) is 100:23
   Original Route Distinguisher (RD) is 100:23
   MPLS in-label is none
   MPLS in-label block size is 0
   MPLS out-label is 106
   MPLS out-label block size is 10
   Next hop IP address is 2.2.2.2 (metric 3)
   Multi-exit discriminator is not present
   Local preference is 100
   Weight is 0
   Origin is IGP
   AS path is empty
   Extended communities RT:100:3 Layer2:atm-vcc-cell:use-cw,use-seq,:mtu=0
   Status Vector 0x7fc0

Meaning

Table 3 lists the show ip bgp l2vpn command output fields

Table 3: show ip bgp l2vpn Output Fields

Field Name	Field Description
Local BGP identifier	IP address of the local PE router
local AS	Autonomous system number
Local-RIB version	Version number of the local routing information base
FIB version	Version number of the forwarding information base
Status codes	Status codes for the route, listed before the Prefix: >—best route *—invalid route s—suppressed route d—dampened route r—rejected route a—auto-summarized m—multihomed backup route
Prefix	Route prefix in the format siteID:blockOffset
Peer	IP address of the peer from which the route was learned
Next-hop (or Next hop IP address)	IP address of the next router that is used when a packet is forwarded to the destination network
MED	Multiexit discriminator for the route
LocPrf	Local preference for the route
Weight	Weight of the route
Origin	Origin of the route
AS Path	AS path through which this route has been advertised
Extended communities	Description of the L2VPN extended communities that the router uses to determine which routes are imported by the specified VPWS instance. Includes route target, community type, encapsulation, control word and sequencing use, L2VPN link MTU.
BGP Operational state	Operational state, up or down
Status Vector	Hexadecimal representation of the status vector bits attached to the route

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