Etherchannel over L2VPN

Etherchannel over L2VPN

Etherchannel is a link aggregation technology. It allows grouping of several physical Ethernet links to create one logical link. Up to 8 links can be aggregated to form a Port-channel logical interface. Spanning-tree (STP) blocks redundant links, Etherchannel allows load-balancing across those links.

Some guidelines to creating a port-channel-

Interfaces in the channel do not have to be physically next to each other
All bundle interfaces must have same speed and duplex settings
All bundle interfaces must be assigned to same VLAN or all interfaces must be trunks. If they are all trunks, they must be carrying same VLANs and same encapsulation mode

Network topology:

A Layer-2 Etherchannel is setup between SW1 and SW2 customer switches.

Etherchannel configuration on switches

interface Port-channel1

 switchport mode trunk

interface FastEthernet1/0

 switchport mode trunk

 channel-group 1 mode on

interface FastEthernet1/1

 switchport mode trunk

 channel-group 1 mode on

interface FastEthernet1/2

 switchport access vlan 10

There are two options to terminate the Etherchannel originating from customer switches-

to terminate the Etherchannel on PE routers. Then apply the xconnect on the port-channel interface on the PE.
Apply the xconnect on the physical interfaces itself- one Pseudowire per link which allows end-to-end Etherchannel

This configuration will use option-2.

PW configuration on PE

PE1 router:

interface Loopback 0

 ip address 1.1.1.1 255.255.255.255

interface fastethernet 1/0

 xconnect 2.2.2.2 100 encapsulation mpls

interface fastethernet 1/1

 xconnect 2.2.2.2 200 encapsulation mpls

PE2 router:

interface Loopback 0

 ip address 2.2.2.2 255.255.255.255

interface fastethernet 1/0

 xconnect 1.1.1.1 100 encapsulation mpls

interface fastethernet 1/1

 xconnect 1.1.1.1 200 encapsulation mpls

Verification:

The show etherchannel summary command shows the status of the Etherchannel and the interfaces assigned to the port-channel.

Etherchannel status

SW1# show etherchannel 1 port-channel

                Port-channels in the group:

                ----------------------

Port-channel: Po1

------------

Age of the Port-channel   = 00d:00h:49m:05s

Logical slot/port   = 8/0           Number of ports = 2

GC                  = 0x00010001      HotStandBy port = null

Port state          = Port-channel Ag-Inuse

Ports in the Port-channel:

Index   Port   EC state

------+------+------------

  1     Fa1/0    on

  0     Fa1/1    on

Time since last port bundled:    00d:00h:45m:45s    Fa1/0

SW1# show etherchannel 1 summary

Flags:  D - down        P - in port-channel

        I - stand-alone s - suspended

        R - Layer3      S - Layer2

        U - in use

Group Port-channel  Ports

-----+------------+-----------------------------------------------------------

1     Po1(SU)     Fa1/0(P)   Fa1/1(P)

SW1# show etherchannel 1 detail

Group state = L2

Ports: 2   Maxports = 8

Port-channels: 1 Max Port-channels = 1

                Ports in the group:

                -------------------

Port: Fa1/0

------------

Port state    = Up Mstr In-Bndl

Channel group = 1           Mode = On/FEC     Gcchange = 0

Port-channel  = Po1         GC   = 0x00010001    Pseudo port-channel = Po1

Port index    = 1

Age of the port in the current state: 00d:00h:47m:02s

Port: Fa1/1

------------

Port state    = Up Mstr In-Bndl

Channel group = 1           Mode = On/FEC     Gcchange = 0

Port-channel  = Po1         GC   = 0x00010001    Pseudo port-channel = Po1

Port index    = 0

Age of the port in the current state: 00d:00h:47m:08s

                Port-channels in the group:

                ----------------------

Port-channel: Po1

------------

Age of the Port-channel   = 00d:00h:50m:25s

Logical slot/port   = 8/0           Number of ports = 2

GC                  = 0x00010001      HotStandBy port = null

Port state          = Port-channel Ag-Inuse

Ports in the Port-channel:

Index   Port   EC state

------+------+------------

  1     Fa1/0    on

  0     Fa1/1    on

Time since last port bundled:    00d:00h:47m:05s    Fa1/0

The show mpls l2transport vc detail command shows details of Pseudowires.

PW status

PE1# show mpls l2transport vc

Local intf     Local circuit              Dest address    VC ID      Status

-------------  -------------------------- --------------- ---------- ----------

Fa1/0          Ethernet                   2.2.2.2         100        UP

Fa1/1          Ethernet                   2.2.2.2         200        UP

PE1# show mpls l2transport vc detail

Local interface: Fa1/0 up, line protocol up, Ethernet up

  Destination address: 2.2.2.2, VC ID: 100, VC status: up

    Output interface: Fa0/0, imposed label stack {17 19}

    Preferred path: not configured

    Default path: active

    Next hop: 172.16.1.2

  Create time: 00:46:46, last status change time: 00:38:38

  Signaling protocol: LDP, peer 2.2.2.2:0 up

    Targeted Hello: 1.1.1.1(LDP Id) -> 2.2.2.2, LDP is UP

    Status TLV support (local/remote)   : enabled/supported

      LDP route watch                   : enabled

      Label/status state machine        : established, LruRru

      Last local dataplane   status rcvd: No fault

      Last local SSS circuit status rcvd: No fault

      Last local SSS circuit status sent: No fault

      Last local  LDP TLV    status sent: No fault

      Last remote LDP TLV    status rcvd: No fault

      Last remote LDP ADJ    status rcvd: No fault

    MPLS VC labels: local 17, remote 19

    Group ID: local 0, remote 0

    MTU: local 1500, remote 1500

    Remote interface description:

  Sequencing: receive disabled, send disabled

  Control Word: On (configured: autosense)

  VC statistics:

    transit packet totals: receive 181, send 53

    transit byte totals:   receive 22944, send 16423

    transit packet drops:  receive 0, seq error 0, send 0

Local interface: Fa1/1 up, line protocol up, Ethernet up

  Destination address: 2.2.2.2, VC ID: 200, VC status: up

    Output interface: Fa0/0, imposed label stack {17 18}

    Preferred path: not configured

    Default path: active

    Next hop: 172.16.1.2

  Create time: 00:46:45, last status change time: 00:38:38

  Signaling protocol: LDP, peer 2.2.2.2:0 up

    Targeted Hello: 1.1.1.1(LDP Id) -> 2.2.2.2, LDP is UP

    Status TLV support (local/remote)   : enabled/supported

      LDP route watch                   : enabled

      Label/status state machine        : established, LruRru

      Last local dataplane   status rcvd: No fault

      Last local SSS circuit status rcvd: No fault

      Last local SSS circuit status sent: No fault

      Last local  LDP TLV    status sent: No fault

      Last remote LDP TLV    status rcvd: No fault

      Last remote LDP ADJ    status rcvd: No fault

    MPLS VC labels: local 18, remote 18

    Group ID: local 0, remote 0

    MTU: local 1500, remote 1500

    Remote interface description:

  Sequencing: receive disabled, send disabled

  Control Word: On (configured: autosense)

  VC statistics:

    transit packet totals: receive 120, send 3684

    transit byte totals:   receive 19260, send 342952

    transit packet drops:  receive 0, seq error 0, send 0

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