- Priority
- Priority : setup and holding priority
Some
tunnels are more inportance than others. For example, you might have tunnels
carrying VoIP traffic and tunnels carrying data traffic that a competing for
the sme resource. You might simple have spme data tunnels that are more
importance than others.
Each
tunnel has a priority, and more-importance
tunnels take precedence over less-important tunnels. Less-important tunnels
are pushed out of the way and are made to recalculate a path, and their
resource are given to the more important tunnel
EX: tun0 and tun 1 cung di tren 1
duong R1-R2-R4
" show mpls traffic-eng topology "
Truong hop1: bandwidth tun0 = tun1 = 0
|
|
Priority
|
Bandwith
config
|
Total Allocated
|
Global Pool
Reservable
|
|
Tun0 (priority 5
5)
|
5
|
0
|
0
|
50
|
|
|
6
|
0
|
0
|
50
|
|
Tun1 (priority 7
7)
|
7
|
0
|
0
|
50
|
Truong hop2: bandwidth tun1=30, bandwith tun0 = 0
|
|
Priority
|
Bandwith
config
|
Total Allocated
|
Global Pool
Reservable
|
|
Tun0 (priority 5
5)
|
5
|
0
|
0
|
50
|
|
|
6
|
0
|
0
|
50
|
|
Tun1 (priority 7
7)
|
7
|
30
|
30
|
20
|
Truong hop3: bandwidth tun1=30 va bandwidth tun0 = 10
Vi tun 0 pri 5, nen no se preemt bandwith pri 6 and
7.
Truong hop 2: pri 7 co bandwidth con lai = 20,
nhung pri 5 chiem 10 -> con lai 10
pri 6 co bandwidth
con lai = 50 (chua dung), nhung pri5 chiem 10 -> con lai 40
|
|
Priority
|
Bandwith
config
|
Total Allocated
|
Global Pool
Reservable
|
|
Tun0 (priority 5
5)
|
5
|
10
|
10
|
40
|
|
|
6
|
0
|
0
|
40
|
|
Tun1 (priority 7
7)
|
7
|
30
|
30
|
10
|
Truong hop4: bandwidth tun 1=30 , bandwidth tun0 =
40.
pri 7
bandwidth = 30 con lai bandwidth 20
nhung bi Pri5 bandwith = 40,
-> pri7
k du bandwidth -> duong tun1 down de
giai phong bang thong cung cap tun0
|
|
Priority
|
Bandwith
config
|
Total Allocated
|
Global Pool
Reservable
|
|
Tun0 (priority 5
5)
|
5
|
40
|
40
|
10
|
|
|
6
|
0
|
0
|
10
|
|
Tun1 (priority 7
7)
|
7
|
30
|
0
|
10
|
Ketluan: 50k bandwith duoc su dung cho tat ca
gia tri priority 0 -7
Priority
thap la tot nhat, co kha nang chiem giu bang thong cua prority cao hon.
Priority =0 khong bi chiem giu
|
Bw[5]
|
40
|
10
|
|
|
Bw[6]
|
0
|
10
|
|
|
Bw[7]
|
0
|
10
|
|
|
|
|
|
|
|
Tunnel 0
|
40
|
priority
|
7 6
|
|
Tunnel 1
|
30
|
priority
|
7 5
|
Cho
2 tunnel:
Tunnel
1: priority 7 6
Tunnel
2: priority 6 5
Gia
su tunnel 1 up truoc. Khi tunnel 2 up, no se so sanh gia tri setup priority
cua no voi gia tri hold priority cua tunnle 1 neu nho hon thi tunnel 2 len va
tunnel 1 down.
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