Topology:
Use configuration from L2VPN task #2 as initial configuration for this task.
Requirements:
1. Change the solution, so both encapsulation overhead and provisioning efforts are kept to minimum.
You are allowed to change the service provider network configuration for this task.
You are allowed to change the service provider network configuration for this task.
Solution:
Highlight the text below to reveal the solution.
This task requires understanding of L2VPN AToM configuration, and differences between L2TPv3 and AToM options.
AToM overhead is 8 bytes (2 labels) or 12 bytes (2 labels + control word) , vs L2TPv3 overhead is at least 24 bytes (new IP header of 20 bytes + l2tpv3 header of 4 bytes ), plus cookies and transport header overhead which may vary.
Change to AToM to reduce overhead to 12 bytes, and use targeted LDP session between the tunnel endpoints to negotiate the VC labels.
Requirement #1 - enable MPLS and LDP on routers R1, R2 and R3. change xconnect encapsulation from l2tpv3 to mpls. leave the pseudowire protocol to default - ldp.
!
pseudowire-class ATOM
encapsulation mpls
!
!
pseudowire-class ATOM
encapsulation mpls
!
This task requires understanding of L2VPN AToM configuration, and differences between L2TPv3 and AToM options.
AToM overhead is 8 bytes (2 labels) or 12 bytes (2 labels + control word) , vs L2TPv3 overhead is at least 24 bytes (new IP header of 20 bytes + l2tpv3 header of 4 bytes ), plus cookies and transport header overhead which may vary.
Change to AToM to reduce overhead to 12 bytes, and use targeted LDP session between the tunnel endpoints to negotiate the VC labels.
Requirement #1 - enable MPLS and LDP on routers R1, R2 and R3. change xconnect encapsulation from l2tpv3 to mpls. leave the pseudowire protocol to default - ldp.
R1:
!
pseudowire-class ATOM
encapsulation mpls
!
!
router ospf 1
mpls ldp autoconfig
router-id 18.0.1.1
!
!
interface Ethernet1/0
no ip address
no cdp enable
xconnect 18.0.3.3 46 encapsulation mpls pw-class ATOM
!
interface Ethernet1/1
no ip address
!
interface Ethernet1/1.57
encapsulation dot1Q 57
xconnect 18.0.3.3 57 encapsulation mpls pw-class ATOM
!
interface Ethernet1/1.58
encapsulation dot1Q 58
xconnect 18.0.3.3 58 encapsulation mpls pw-class ATOM
!
R3:
!
pseudowire-class ATOM
encapsulation mpls
!
!
router ospf 1
mpls ldp autoconfig
router-id 18.0.3.3
!
interface Ethernet1/0
no ip address
no cdp enable
xconnect 18.0.1.1 46 encapsulation mpls pw-class ATOM
!
interface Ethernet1/1
no ip address
!
interface Ethernet1/1.75
encapsulation dot1Q 75
xconnect 18.0.1.1 57 encapsulation mpls pw-class ATOM
!
interface Ethernet1/2
no ip address
!
interface Ethernet1/2.85
encapsulation dot1Q 85
xconnect 18.0.1.1 58 encapsulation mpls pw-class ATOM
!
Verification:
R1# show mpls ldp neighbor
Peer LDP Ident: 18.0.2.2:0; Local LDP Ident 18.0.1.1:0
TCP connection: 18.0.2.2.59677 - 18.0.1.1.646
State: Oper; Msgs sent/rcvd: 26/27; Downstream
Up time: 00:16:20
LDP discovery sources:
Ethernet0/0, Src IP addr: 18.0.12.2
Addresses bound to peer LDP Ident:
18.0.12.2 18.0.23.2 18.0.2.2
Peer LDP Ident: 18.0.3.3:0; Local LDP Ident 18.0.1.1:0
TCP connection: 18.0.3.3.16095 - 18.0.1.1.646
State: Oper; Msgs sent/rcvd: 26/26; Downstream
Up time: 00:13:20
LDP discovery sources:
Targeted Hello 18.0.1.1 -> 18.0.3.3, active, passive
Addresses bound to peer LDP Ident:
18.0.23.3 18.0.3.3
R1#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 Pop Label 18.0.2.2/32 0 Et0/0 18.0.12.2
17 17 18.0.3.3/32 0 Et0/0 18.0.12.2
18 Pop Label 18.0.23.0/24 0 Et0/0 18.0.12.2
19 No Label l2ckt(46) 22790 Et1/0 point2point
20 No Label l2ckt(57) 630 Et1/1.57 point2point
21 No Label l2ckt(58) 570 Et1/1.58 point2point
R1#show mpls l2transport vc detail
Local interface: Et1/0 up, line protocol up, Ethernet up
Destination address: 18.0.3.3, VC ID: 46, VC status: up
Output interface: Et0/0, imposed label stack {17 19}
Preferred path: not configured
Default path: active
Next hop: 18.0.12.2
Create time: 00:16:21, last status change time: 00:14:03
Signaling protocol: LDP, peer 18.0.3.3:0 up
Targeted Hello: 18.0.1.1(LDP Id) -> 18.0.3.3
Status TLV support (local/remote) : enabled/supported
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
MPLS VC labels: local 19, remote 19
Group ID: local 0, remote 0
MTU: local 1500, remote 1500
Remote interface description:
Sequencing: receive disabled, send disabled
VC statistics:
packet totals: receive 203, send 201
byte totals: receive 22910, send 27693
packet drops: receive 0, seq error 0, send 0
Local interface: Et1/1.57 up, line protocol up, Eth VLAN 57 up
Interworking type is Ethernet
Destination address: 18.0.3.3, VC ID: 57, VC status: up
Output interface: Et0/0, imposed label stack {17 20}
Preferred path: not configured
Default path: active
Next hop: 18.0.12.2
Create time: 00:15:08, last status change time: 00:13:47
Signaling protocol: LDP, peer 18.0.3.3:0 up
Targeted Hello: 18.0.1.1(LDP Id) -> 18.0.3.3
Status TLV support (local/remote) : enabled/supported
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
MPLS VC labels: local 20, remote 20
Group ID: local 0, remote 0
MTU: local 1500, remote 1500
Remote interface description:
Sequencing: receive disabled, send disabled
VC statistics:
packet totals: receive 6, send 6
byte totals: receive 630, send 786
packet drops: receive 0, seq error 0, send 0
Local interface: Et1/1.58 up, line protocol up, Eth VLAN 58 up
Interworking type is Ethernet
Destination address: 18.0.3.3, VC ID: 58, VC status: up
Output interface: Et0/0, imposed label stack {17 21}
Preferred path: not configured
Default path: active
Next hop: 18.0.12.2
Create time: 00:14:55, last status change time: 00:13:27
Signaling protocol: LDP, peer 18.0.3.3:0 up
Targeted Hello: 18.0.1.1(LDP Id) -> 18.0.3.3
Status TLV support (local/remote) : enabled/supported
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
MPLS VC labels: local 21, remote 21
Group ID: local 0, remote 0
MTU: local 1500, remote 1500
Remote interface description:
Sequencing: receive disabled, send disabled
VC statistics:
packet totals: receive 5, send 5
byte totals: receive 570, send 700
packet drops: receive 0, seq error 0, send 0
R4#ping 10.10.64.6 repeat 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 10.10.64.6, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 1/1/5 ms
R5#ping 172.16.57.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.57.7, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
R5#ping 172.16.58.8
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.58.8, timeout is 2 seconds:
!!!!!