Cisco ASR 9000 Series Configuration Manual page 88

Selective VRF Download Disable
• o is the number of VRF directly provisioned/configured on the card, (n is greater than or equal to o)
• R is routes per VRF
• x is the ratio of SVD local: total routes
• Y is the number of VRFs dependant on directly provisioned VRFs (o), (Y is greater than or equal to 0)
Here is an example calculation:
A customer has 100 VRFs configured on the system, with five line cards. For the IPv4 address family, four
line cards are working as customer facing with equal VRF distribution, while one is core facing. Inter-table
dependencies do not exist. In this example, n = 100, o = 25, x = 3/10, Y = 0, and R = 1000.
Number of routes downloaded:
• Without SVD: (nR) = 100,000
• On customer-facing card: (o+Y)R = 25,000
• On core-facing card: (nxR) = 30,000
In this example, the SVD feature brings close to 70 per cent savings.
The total number of VRFs present (n) can be found by using the show cef tables summary location node-id
command on the RSP card.
RP/0/RSP0/CPU0:router#show cef tables summary location 0/rsp0/cpu0
Role change timestamp
Current Role
No. of times Eod received : 2
Eod received
No. of Tables
No. of Converged Tables
No. of Deleted Tables
No. of Bcdl Subscribed Tables :
No. of Marked Tables
The number of VRFs provisioned on the line card (o) is derived from the "No. Of Tables" field in the show
cef tables summary location 0/0/cpu0. This provides the tables specific to the Linecard 0/0/cpu0.
The routes per VRF (R) can be found using the show cef tables location node-id command.
RP/0/RSP0/CPU0:router#show cef tables location 0/1/CPU0
Sat Apr
Codes:
Table
default
**nVSatellite
cdn
oir
vrf1
For the vrf "vrf1" the total routes is in the "T" column which is 11. So if the number of routes per VRF are
not the same for all vrfs then total of "routes in all non-default" vrfs will have to be calculated and divided by
the number of VRFs, to arrive at the Average Routes per VRF.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
60
: Apr
: Core
: Apr
:
:
:
:
6 01:22:32.471 UTC
L - SVD Local Routes, R - SVD Remote Routes
T - Total Routes
C - Table Converged, D - Table Deleted
M - Table Marked, S - Table Subscribed
Table ID
0xe0000000
0xe0000010
0xe0000011
0xe0000012
0xe0000013
3 07:21:46.759
3 07:21:46.980
106
106
0
106
0
L R
9 3
1 0
0 0
0 0
3 1
Implementing BGP
T C D M S
23 Y N N Y
6 Y N N Y
5 Y N N Y
5 Y N N Y
11 Y N N Y
OL-30423-03