eng-mssk: MPLS TE with Explicit Paths

Issue

In this example we will go through MPLS L3VPN using RSVP as our label protocol as well as going through TE and how we will control our traffic as needed using explicit paths and using dynamic path option as our backup in case of link failure inside the backbone

The IGP inside the network used is ISIS and static routing is PE-CE routing protocols

Configuration

R1#sh run int f1/0

interface FastEthernet1/0

ip address 192.1.12.1 255.255.255.0

speed 100

duplex full

R1#sh run int lo0

interface Loopback0

ip address 1.1.1.1 255.255.255.255

R1#sh run | sec ip route

ip route 0.0.0.0 0.0.0.0 192.1.12.2

R2#sh run int f1/0

interface FastEthernet1/0

vrf forwarding MSSK

ip address 192.1.12.2 255.255.255.0

speed 100

duplex full

R2#sh run int f1/1

interface FastEthernet1/1

ip address 192.1.23.2 255.255.255.0

ip router isis 1

speed 100

duplex full

mpls traffic-eng tunnels

isis metric 20

ip rsvp bandwidth

R2#sh run int f2/0

interface FastEthernet2/0

ip address 192.1.25.2 255.255.255.0

ip router isis 1

speed 100

duplex full

mpls traffic-eng tunnels

ip rsvp bandwidth

R2#sh run int lo0

interface Loopback0

ip address 2.2.2.2 255.255.255.255

R2#sh run int tun0

tunnel mode mpls traffic-eng

ip unnumbered loopback0

tunnel destination 4.4.4.4

tunnel mpls traffic-eng autoroute announce

tunnel mpls traffic-eng path-option 1 explicit name PATH

tunnel mpls traffic-eng path-option 2 dynamic

R2#sh run | sec ip route

ip route vrf MSSK 1.1.1.1 255.255.255.255 192.1.12.1

R2#sh run | sec vrf def

vrf definition MSSK

rd 100:1

route-target export 100:1

route-target import 100:1

address-family ipv4

exit-address-family

R2#sh run | sec router isis

router isis 1

net 49.0001.0000.0000.0002.00

is-type level-2-only

metric-style wide

passive-interface Loopback0

mpls traffic-eng router-id Loopback0

mpls traffic-eng level-2

R2#sh run | sec router bgp

router bgp 100

bgp log-neighbor-changes

no bgp default ipv4-unicast

neighbor 4.4.4.4 remote-as 100

neighbor 4.4.4.4 update-source Loopback0

address-family ipv4

exit-address-family

address-family vpnv4

neighbor 4.4.4.4 activate

neighbor 4.4.4.4 send-community both

exit-address-family

address-family ipv4 vrf MSSK

network 1.1.1.1 mask 255.255.255.255

network 192.1.12.0

exit-address-family

R2#sh run | inc mpls

mpls traffic-eng tunnels

ip explicit-paths name PATH

next-address 192.1.23.3

next-address 192.1.35.5

next-address 192.1.45.4

next-address 4.4.4.4

R3#sh run int f1/0

interface FastEthernet1/0

ip address 192.1.23.3 255.255.255.0

ip router isis 1

speed 100

duplex full

mpls traffic-eng tunnels

ip rsvp bandwidth

R3#sh run int f1/1

interface FastEthernet1/1

ip address 192.1.34.3 255.255.255.0

ip router isis 1

speed 100

duplex full

mpls traffic-eng tunnels

ip rsvp bandwidth

R3#sh run int f2/0

interface FastEthernet2/0

ip address 192.1.35.3 255.255.255.0

ip router isis 1

shutdown

speed 100

duplex full

mpls traffic-eng tunnels

ip rsvp bandwidth

R3#sh run int lo0

interface Loopback0

ip address 3.3.3.3 255.255.255.255

R3#sh run | sec router isis

router isis 1

net 49.0001.0000.0000.0003.00

is-type level-2-only

metric-style wide

passive-interface Loopback0

mpls traffic-eng router-id Loopback0

mpls traffic-eng level-2

R3#sh run | inc mpls

mpls traffic-eng tunnels

R4#sh run int f1/0

interface FastEthernet1/0

vrf forwarding MSSK

ip address 192.1.46.4 255.255.255.0

speed 100

duplex full

R4#sh run int f1/1

interface FastEthernet1/1

ip address 192.1.34.4 255.255.255.0

ip router isis 1

speed 100

duplex full

mpls traffic-eng tunnels

ip rsvp bandwidth

R4#sh run int f2/0

interface FastEthernet2/0

ip address 192.1.45.4 255.255.255.0

ip router isis 1

speed 100

duplex full

mpls traffic-eng tunnels

ip rsvp bandwidth

R4#sh run int lo0

interface Loopback0

ip address 4.4.4.4 255.255.255.255

R4#sh run int tun0

tunnel mode mpls traffic-eng

ip unnumbered loopback0

tunnel destination 2.2.2.2

tunnel mpls traffic-eng autoroute announce

tunnel mpls traffic-eng path-option 1 explicit name PATH

tunnel mpls traffic-eng path-option 2 dynamic

R4#sh run | sec router isis

router isis 1

net 49.0001.0000.0000.0004.00

is-type level-2-only

metric-style wide

passive-interface Loopback0

mpls traffic-eng router-id Loopback0

mpls traffic-eng level-2

R4#sh run | sec router bgp

router bgp 100

bgp log-neighbor-changes

no bgp default ipv4-unicast

neighbor 2.2.2.2 remote-as 100

neighbor 2.2.2.2 update-source Loopback0

address-family ipv4

exit-address-family

address-family vpnv4

neighbor 2.2.2.2 activate

neighbor 2.2.2.2 send-community both

exit-address-family

address-family ipv4 vrf MSSK

network 6.6.6.6 mask 255.255.255.255

network 192.1.46.0

exit-address-family

R4#sh run | inc mpls

mpls traffic-eng tunnels

R4#sh run | inc ip route

ip route vrf MSSK 6.6.6.6 255.255.255.255 192.1.46.6

ip explicit-paths name PATH

next-address 192.1.45.5

next-address 192.1.35.3

next-address 192.1.23.2

next-address 2.2.2.2

R5#sh run int f1/0

interface FastEthernet1/0

ip address 192.1.25.5 255.255.255.0

ip router isis 1

speed 100

duplex full

mpls traffic-eng tunnels

ip rsvp bandwidth

R5#sh run int f1/1

interface FastEthernet1/1

ip address 192.1.45.5 255.255.255.0

ip router isis 1

speed 100

duplex full

mpls traffic-eng tunnels

ip rsvp bandwidth

R5#sh run int f2/0

interface FastEthernet2/0

ip address 192.1.35.5 255.255.255.0

ip router isis 1

speed 100

duplex full

mpls traffic-eng tunnels

ip rsvp bandwidth

R5#sh run int lo0

interface Loopback0

ip address 5.5.5.5 255.255.255.255

R5#sh run | sec router isis

router isis 1

net 49.0001.0000.0000.0005.00

is-type level-2-only

metric-style wide

passive-interface Loopback0

mpls traffic-eng router-id Loopback0

mpls traffic-eng level-2

R5#sh run | inc mpls

mpls traffic-eng tunnels

R6#sh run int f1/0

interface FastEthernet1/0

ip address 192.1.46.6 255.255.255.0

speed 100

duplex full

R6#sh run int lo0

interface Loopback0

ip address 6.6.6.6 255.255.255.255

R6#sh run | inc ip route

ip route 0.0.0.0 0.0.0.0 192.1.46.4

Verification

Testing reachablity between our CEs

R1#ping 6.6.6.6 source 1.1.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:

Packet sent with a source address of 1.1.1.1

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 20/22/28 ms

R1#traceroute 6.6.6.6 source lo0

Type escape sequence to abort.

Tracing the route to 6.6.6.6

VRF info: (vrf in name/id, vrf out name/id)

1 192.1.12.2 4 msec 4 msec 4 msec

2 192.1.23.3 [MPLS: Labels 16/16 Exp 0] 28 msec 20 msec 20 msec

3 192.1.35.5 [MPLS: Labels 17/16 Exp 0] 24 msec 20 msec 20 msec

4 192.1.46.4 [MPLS: Label 16 Exp 0] 20 msec 16 msec 16 msec

5 192.1.46.6 20 msec 20 msec *

Checking our explicit path configured

R2#sh ip explicit-paths

PATH PATH (strict source route, path complete, generation 13)

1: next-address 192.1.23.3

2: next-address 192.1.35.5

3: next-address 192.1.45.4

4: next-address 4.4.4.4

R6#traceroute 1.1.1.1 sou lo0

Type escape sequence to abort.

Tracing the route to 1.1.1.1

VRF info: (vrf in name/id, vrf out name/id)

1 192.1.46.4 8 msec 0 msec 4 msec

2 192.1.45.5 [MPLS: Labels 19/16 Exp 0] 24 msec 20 msec 20 msec

3 192.1.35.3 [MPLS: Labels 18/16 Exp 0] 20 msec 20 msec 20 msec

4 192.1.12.2 [MPLS: Label 16 Exp 0] 20 msec 16 msec 16 msec

5 192.1.12.1 20 msec 20 msec *

R4#sh ip explicit-paths

PATH PATH (strict source route, path complete, generation 11)

1: next-address 192.1.45.5

2: next-address 192.1.35.3

3: next-address 192.1.23.2

4: next-address 2.2.2.2

R2#sh mpls traffic-eng tunnels

P2P TUNNELS/LSPs:

Name: R2_t0 (Tunnel0) Destination: 4.4.4.4

Status:

Admin: up Oper: up Path: valid Signalling: connected

path option 1, type explicit PATH (Basis for Setup, path weight 40)

Config Parameters:

Bandwidth: 0 kbps (Global) Priority: 7 7 Affinity: 0x0/0xFFFF

Metric Type: TE (default)

AutoRoute: enabled LockDown: disabled Loadshare: 0 [0] bw-based

auto-bw: disabled

Active Path Option Parameters:

State: explicit path option 1 is active

BandwidthOverride: disabled LockDown: disabled Verbatim: disabled

InLabel : -

OutLabel : FastEthernet1/1, 16

Next Hop : 192.1.23.3

RSVP Signalling Info:

Src 2.2.2.2, Dst 4.4.4.4, Tun_Id 0, Tun_Instance 8812

RSVP Path Info:

My Address: 192.1.23.2

Explicit Route: 192.1.23.3 192.1.35.3 192.1.35.5 192.1.45.5

192.1.45.4 4.4.4.4

Record Route: NONE

Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits

RSVP Resv Info:

Record Route: NONE

Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits

History:

Tunnel:

Time since created: 3 days, 59 minutes

Time since path change: 5 minutes, 8 seconds

Number of LSP IDs (Tun_Instances) used: 8812

Current LSP: [ID: 8812]

Uptime: 4 minutes, 58 seconds

Selection: reoptimization

Prior LSP: [ID: 8811]

ID: path option unknown

Removal Trigger: configuration changed

LSP Tunnel R4_t0 is signalled, connection is up

InLabel : FastEthernet1/1, implicit-null

Prev Hop : 192.1.23.3

OutLabel : -

RSVP Signalling Info:

Src 4.4.4.4, Dst 2.2.2.2, Tun_Id 0, Tun_Instance 8805

RSVP Path Info:

My Address: 2.2.2.2

Explicit Route: NONE

Record Route: NONE

Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits

RSVP Resv Info:

Record Route: NONE

Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits

P2MP TUNNELS:

P2MP SUB-LSPS:

R2#sh mpls forwarding-table

Local Outgoing Prefix Bytes Label Outgoing Next Hop

Label Label or Tunnel Id Switched interface

16 No Label 1.1.1.1/32[V] 12776 Fa1/0 192.1.12.1

17 No Label 192.1.12.0/24[V] 0 aggregate/MSSK

R3#sh mpls forwarding-table

Local Outgoing Prefix Bytes Label Outgoing Next Hop

Label Label or Tunnel Id Switched interface

16 17 2.2.2.2 0 [8812] 3934 Fa2/0 192.1.35.5

18 Pop Label 4.4.4.4 0 [8805] 4152 Fa1/0 192.1.23.2

Now, we want to configure backup using lower priority path option

R2(config)#int tun0

R2(config-if)#tunnel mpls traffic-eng path-option 2 dynamic

R4(config)#int tun0

R4(config-if)#tunnel mpls traffic-eng path-option 2 dynamic

Now, shutting down one of the links across the explicit path

R3#conf t

Enter configuration commands, one per line. End with CNTL/Z.

R3(config)#int f2/0

R3(config-if)#shutdown

R2#sh mpls traffic-eng tunnels

P2P TUNNELS/LSPs:

Name: R2_t0 (Tunnel0) Destination: 4.4.4.4

Status:

Admin: up Oper: up Path: valid Signalling: connected

path option 2, type dynamic (Basis for Setup, path weight 20)

path option 1, type explicit PATH

Config Parameters:

Bandwidth: 0 kbps (Global) Priority: 7 7 Affinity: 0x0/0xFFFF

Metric Type: TE (default)

AutoRoute: enabled LockDown: disabled Loadshare: 0 [0] bw-based

auto-bw: disabled

Active Path Option Parameters:

State: dynamic path option 2 is active

BandwidthOverride: disabled LockDown: disabled Verbatim: disabled

InLabel : -

OutLabel : FastEthernet2/0, 18

Next Hop : 192.1.25.5

RSVP Signalling Info:

Src 2.2.2.2, Dst 4.4.4.4, Tun_Id 0, Tun_Instance 8814

RSVP Path Info:

My Address: 192.1.25.2

Explicit Route: 192.1.25.5 192.1.45.5 192.1.45.4 4.4.4.4

Record Route: NONE

Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits

RSVP Resv Info:

Record Route: NONE

Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits

History:

Tunnel:

Time since created: 3 days, 1 hours, 3 minutes

Time since path change: 59 seconds

Number of LSP IDs (Tun_Instances) used: 8814

Current LSP: [ID: 8814]

Uptime: 59 seconds

Selection: reoptimization

Prior LSP: [ID: 8812]

ID: path option unknown

Removal Trigger: path error

LSP Tunnel R4_t0 is signalled, connection is up

InLabel : FastEthernet1/1, implicit-null

Prev Hop : 192.1.23.3

OutLabel : -

RSVP Signalling Info:

Src 4.4.4.4, Dst 2.2.2.2, Tun_Id 0, Tun_Instance 8807

RSVP Path Info:

My Address: 2.2.2.2

Explicit Route: NONE

Record Route: NONE

Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits

RSVP Resv Info:

Record Route: NONE

Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits

P2MP TUNNELS:

P2MP SUB-LSPS:

R1#traceroute 6.6.6.6 source lo0

Type escape sequence to abort.

Tracing the route to 6.6.6.6

VRF info: (vrf in name/id, vrf out name/id)

1 192.1.12.2 4 msec 0 msec 4 msec

2 192.1.25.5 [MPLS: Labels 18/16 Exp 0] 20 msec 16 msec 16 msec

3 192.1.46.4 [MPLS: Label 16 Exp 0] 24 msec 8 msec 12 msec

4 192.1.46.6 16 msec 16 msec *

As we can see end to end reachability is maintained but the path now is different as we are using the dynamic one

eng-mssk

Saturday, December 22, 2012

MPLS TE with Explicit Paths

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