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# Monitoring BGP-Related Settings for VPWS L2VPNs

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 102 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 102: 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 103 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 103: 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 Configuring BGP Routing and Configuring BGP-MPLS Applications.

Purpose

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 104 lists the show ip bgp l2vpn command output fields

Table 104: 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

#### Related Topics

- show ip bgp
- show ip bgp advertised-routes
- show ip bgp community
- show ip bgp community-list
- show ip bgp dampened-paths
- show ip bgp filter-list
- show ip bgp flap-statistics
- show ip bgp neighbors
- show ip bgp neighbors dampened-routes
- show ip bgp neighbors received-routes
- show ip bgp neighbors routes
- show ip bgp next-hops
- show ip bgp paths
- show ip bgp peer-group
- show ip bgp quote-regexp
- show ip bgp regexp
- show ip bgp summary

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