Hi, List!
May be these questions was discussed earlier... can't find it...
Please give me some links than.
I'm tring to clarify my understanding of switching paths on these
line cards. From one point of view, Cisco docs says that if the
traffic should ingress via one port on the line card and then
should egress through another port on the same line card it will
never leave this line card. So it will be switched via internal
bus. Right?
At one of our POPs we have Cisco 7606-S chassis with the folowing:
Mod Ports Card Type Model
--- ----- -------------------------------------- ------------------
2 4 CEF720 4 port 10-Gigabit Ethernet WS-X6704-10GE
3 48 CEF720 48 port 1000mb SFP WS-X6748-SFP
4 48 CEF720 48 port 10/100/1000mb Ethernet WS-X6748-GE-TX
5 2 Route Switch Processor 720 (Active) RSP720-3CXL-GE
At peaks we see total ingress thraffic on all 10GE ports around
30-32Gbps and increase of overruns on all 10GE ports.
Utilization of the fabric and forwarding performance are as folows:
Switch Fabric Resources
Bus utilization: current: 10%, peak was 51% at 21:31:26 EET Sat Feb
18 2012
Fabric utilization: Ingress Egress
Module Chanl Speed rate peak rate peak
2 0 20G 15% 46% @22:57 30Jan12 15% 49% @22:02
31Jan12
2 1 20G 15% 49% @20:08 01Feb12 15% 46% @20:14
25Feb12
3 0 20G 0% 2% @10:49 02Feb12 0% 1% @14:16
30Jan12
3 1 20G 1% 1% @14:16 30Jan12 0% 2% @19:25
30Jan12
4 0 20G 1% 16% @19:22 11Feb12 3% 11% @19:40
04Feb12
4 1 20G 3% 9% @22:23 31Jan12 1% 10% @19:23
11Feb12
5 0 20G 0% 1% @14:16 30Jan12 0% 2% @21:24
10Feb12
Switching mode: Module
Switching mode
2
compact
3
compact
4
compact
5
compact
a
L2 Forwarding Resources
MAC Table usage: Module Collisions Total Used
%Used
5 0 98304 292
1%
VPN CAM usage: Total Used
%Used
512 0
0%
L3 Forwarding Resources
Module FIB TCAM usage: Total
Used %Used
5 72 bits (IPv4, MPLS, EoM) 524288
13963 3%
144 bits (IP mcast, IPv6) 262144
316 1%
detail: Protocol Used
%Used
IPv4 7057
1%
MPLS 6897
1%
EoM 9
1%
IPv6 117
1%
IPv4 mcast 196
1%
IPv6 mcast 3
1%
Adjacency usage: Total Used
%Used
1048576 7759
1%
Forwarding engine load:
Module pps peak-pps
peak-time
5 1965007 10703659 21:31:21 EET Sat Feb
18 2012
Actually, typical PPS is about 5-6 millions at peak times in evening
and bus utilization is about 20%.
I made simple calculations and found that about 16Gbps switched via
internal bus at line card and about 14-15 Gbps switched via fabric.
So the problem is internal 16Gbps (atually 16Gbps+16Gbps?) bus on
linecard.
So, the possible solution seems to install additional 6704 line
card ad distribute links between them according to main traffic flows.
Is it correct that CFC is not an issue in this particular situation?
D-Bus is not overutilized yet. I agree that this is goog to install
DFC dauter cards (or even 6708 with DFC), but not now.
I kbow that WS-X6708 much better option (and it is DFC), but now we
have no possibility to replace all 6704 by 6708 ones.
Is it all correct or I'm missing something?
Is it possible somehow to disable switching via internal bus on linecard
and reroute all traffic via fabric?
Similar problem was found on another router with WS-X6708 line card.
After swapping some 10GE links between ports most part of traffic
starts to go via fabric. And overruns disappeared.
Thanks in advance!
--
Sincerely yours,
Artyom Viklenko.
-------------------------------------------------------
ar...@aws-net.org.ua | http://www.aws-net.org.ua/~artem
ar...@viklenko.net | JID: ar...@jabber.aws-net.org.ua
FreeBSD: The Power to Serve - http://www.freebsd.org
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