LAB3: LSP Inter Area OSPF

Penasaran saat diskusi dengan teman sekantor terkait LSP yang melewati Area OSPF yang berbeda (along the path).

topologi LSP.jpegada dua hal dalama diskusi tersebut:

1. Apakah TE itu bisa lewat meskipun berbeda area OSPF?

2. Apakah RSVP atau LDP? atau dua-duanya dipakai dalam TE?

Saya mencoba nge-lab untuk mengecek kedua pertanyaan tersebut.

Saya buat PATH dari XRv-PE2 –>R4->iosxr-pe2->R3, dan path ini via tunnel-te2 (tujuan 4.4.4.4). Path lain dibuat dari XRv-PE2–>R1->iosxr-pe2 (tujuan 3.3.3.3). Di router iosxr-pe2 dan R3 adalah area border. RSVP dan LDP dienable di sepanjang path.

RP/0/0/CPU0:XRv-PE2#show running-config explicit-path
Fri Feb 20 14:53:27.749 UTC

explicit-path name TEST

index 1 next-address strict ipv4 unicast 192.168.12.1

index 2 next-address strict ipv4 unicast 192.168.13.2

index 3 next-address strict ipv4 unicast 3.3.3.3

!

explicit-path name TEST2

index 1 next-address loose ipv4 unicast 192.168.16.2

index 2 next-address loose ipv4 unicast 192.168.46.1

index 3 next-address loose ipv4 unicast 3.3.3.3

!

explicit-path name LSP-TEST

index 1 next-address loose ipv4 unicast 192.168.16.2

index 2 next-address loose ipv4 unicast 192.168.46.1

index 3 next-address loose ipv4 unicast 192.168.34.2

index 4 next-address loose ipv4 unicast 4.4.4.4

!

explicit-path name LSP-TEST2

index 1 next-address loose ipv4 unicast 192.168.12.1

index 2 next-address loose ipv4 unicast 192.168.13.2

index 3 next-address loose ipv4 unicast 192.168.34.2

index 4 next-address loose ipv4 unicast 4.4.4.4

!

ketika menggunakan STRICT, ternyata tunnel ke arah 4.4.4.4 tidak bisa naik namun setelah diubah jadi LOOSE, tunnel pun naik. Seorang teman menunjukan sebuah dokumen bahwa ada restriksi jika path TE itu melewati AREA OSPF yang berbeda maka tidak bisa dilakukan.

RP/0/0/CPU0:XRv-PE2#

RP/0/0/CPU0:XRv-PE2#sh int description | in up

Fri Feb 20 14:49:27.185 UTC

Lo0               up         up

Nu0               up         up

tt1               up         up         Tunnel-TE to 3.3.3.3

tt2               up         up         Tunnel-TE to 4.4.4.4

Gi0/0/0/0         up         up         to R1 port Gi0/0

RP/0/0/CPU0:XRv-PE2#show mpls traffic-eng tunnels destination 4.4.4.4

Fri Feb 20 15:03:50.006 UTC

 Name: tunnel-te2 Destination: 4.4.4.4

Signalled-Name: XRv-PE2_t2

Status:

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

    path option 1, type explicit LSP-TEST (Basis for Setup, path weight 1)

   G-PID: 0x0800 (derived from egress interface properties)

   Bandwidth Requested: 0 kbps CT0

   Creation Time: Fri Feb 20 09:59:34 2015 (05:04:16 ago)

Config Parameters:

   Bandwidth:       0 kbps (CT0) Priority: 7 7 Affinity: 0x0/0xffff

   Metric Type: TE (default)

   Hop-limit: disabled

   Cost-limit: disabled

   AutoRoute: disabled LockDown: disabled   Policy class: not set

   Forward class: 0 (default)

   Forwarding-Adjacency: disabled

   Loadshare:         0 equal loadshares

   Auto-bw: disabled

   Fast Reroute: Disabled, Protection Desired: None

   Path Protection: Not Enabled

   BFD Fast Detection: Disabled

   Reoptimization after affinity failure: Enabled

   Soft Preemption: Disabled

History:

   Tunnel has been up for: 03:13:25 (since Fri Feb 20 11:50:25 UTC 2015)

   Current LSP:

     Uptime: 03:13:25 (since Fri Feb 20 11:50:25 UTC 2015)

   Reopt. LSP:

     Last Failure:

       LSP not signalled, identical to the [CURRENT] LSP

       Date/Time: Fri Feb 20 14:59:18 UTC 2015 [00:04:32 ago]

   Prior LSP:

     ID: 4 Path Option: 1

     Removal Trigger: tunnel shutdown

 

Path info (OSPF 100 area 0):

Node hop count: 1

Hop0: 192.168.16.2

Hop1: 6.6.6.6

Hop2: 192.168.46.1

Hop3: 192.168.34.2

Hop4: 4.4.4.4

Displayed 1 (of 2) heads, 0 (of 0) midpoints, 0 (of 0) tails

Displayed 1 up, 0 down, 0 recovering, 0 recovered heads

RP/0/0/CPU0:XRv-PE2#

RP/0/0/CPU0:XRv-PE2#show route | in tunnel-te

Pertanyaan pertama berhasil dijawab, bahwa TE bisa dilakukan meski beda OSPF Area.

Pertanyaan kedua, apakah LDP atau RSVP atau kedua-duanya harus dienable?hmmm…

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