[c-nsp] huge amount of mcast traffic
Matthew Huff
mhuff at ox.com
Thu Oct 13 12:31:51 EDT 2016
The 6748 blades are going to be an issue with buffer overruns. Whether this will be a minor or major issue depends on the application that uses the multicast data.
----
Matthew Huff | 1 Manhattanville Rd
Director of Operations | Purchase, NY 10577
OTA Management LLC | Phone: 914-460-4039
aim: matthewbhuff | Fax: 914-694-5669
From: james list [mailto:jameslist72 at gmail.com]
Sent: Thursday, October 13, 2016 12:25 PM
To: Matthew Huff <mhuff at ox.com>
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] huge amount of mcast traffic
Hi
I’m not able to find the multicast replication mode on ASR..
On core routers:
C6807 has Supervisor Engine 2T 10GE and IOS 15.1(2)SY4
xxx>sh module
Mod Ports Card Type Model Serial No.
--- ----- -------------------------------------- ------------------ -----------
1 20 DCEF2T 4 port 40GE / 16 port 10GE WS-X6904-40G xx
2 20 DCEF2T 4 port 40GE / 16 port 10GE WS-X6904-40G xx
3 5 Supervisor Engine 2T 10GE w/ CTS (Acti VS-SUP2T-10G xx
5 48 CEF720 48 port 10/100/1000mb Ethernet WS-X6848-GE-TX xx
Mod Sub-Module Model Serial Hw Status
---- --------------------------- ------------------ ----------- ------- -------
1 Distributed Forwarding Card WS-F6K-DFC4-E xxx 1.2 Ok
2 Distributed Forwarding Card WS-F6K-DFC4-E xxx 1.2 Ok
3 Policy Feature Card 4 VS-F6K-PFC4 xxx 3.0 Ok
3 CPU Daughterboard VS-F6K-MSFC5 xxx 3.0 Ok
5 Distributed Forwarding Card WS-F6K-DFC4-A xxx 1.4 Ok
xxx#sh platform multicast routing replication
Current mode of replication is Egress
Configured mode of replication is Egress
Switch Slot Multicast replication capability
1 1 Egress
1 2 Egress
1 3 Egress
1 5 Egress
2 1 Egress
2 2 Egress
2 3 Egress
2 5 Egress
4 1 Ingress
3 1 Ingress
5 1 Ingress
C6500 has Supervisor Engine 720 10GE and IOS 12.2(33)SXI5
xxx>sh module
Mod Ports Card Type Model Serial No.
--- ----- -------------------------------------- ------------------ -----------
1 48 CEF720 48 port 10/100/1000mb Ethernet WS-X6748-GE-TX xxx
2 8 CEF720 8 port 10GE with DFC WS-X6708-10GE xxx
3 48 CEF720 48 port 10/100/1000mb Ethernet WS-X6748-GE-TX xxx
4 48 CEF720 48 port 1000mb SFP WS-X6748-SFP xxx
5 5 Supervisor Engine 720 10GE (Active) VS-S720-10G xxx
Mod Sub-Module Model Serial Hw Status
---- --------------------------- ------------------ ----------- ------- -------
1 Distributed Forwarding Card WS-F6700-DFC3C xxx 1.6 Ok
2 Distributed Forwarding Card WS-F6700-DFC3C xxx 1.8 Ok
3 Distributed Forwarding Card WS-F6700-DFC3C xxx 1.6 Ok
4 Centralized Forwarding Card WS-F6700-CFC xxx 4.2 Ok
5 Policy Feature Card 3 VS-F6K-PFC3C xxx 1.1 Ok
5 MSFC3 Daughterboard VS-F6K-MSFC3 xxx 1.0 Ok
xxx>show mls ip multicast capability
Current mode of replication is Egress
Configured replication mode is Auto
Slot Multicast replication capability
1 Egress
2 Egress
3 Egress
4 Egress
5 Egress
Cheers
2016-10-13 17:59 GMT+02:00 Matthew Huff <mhuff at ox.com<mailto:mhuff at ox.com>>:
Even with fabric enable blades in the c6500, you are going to get massive output buffer overflows. Market data has very uneven traffic patterns causing microburst effects. What sup-engines/blades are on the boxes? What type of multicast replication is being used (ingress/egress). QoS policies typically make matters worse. What type of interfaces are on the 6500?
----
Matthew Huff | 1 Manhattanville Rd
Director of Operations | Purchase, NY 10577
OTA Management LLC | Phone: 914-460-4039<tel:914-460-4039>
aim: matthewbhuff | Fax: 914-694-5669<tel:914-694-5669>
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net<mailto:cisco-nsp-bounces at puck.nether.net>] On Behalf Of
> james list
> Sent: Thursday, October 13, 2016 10:45 AM
> To: cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>
> Subject: [c-nsp] huge amount of mcast traffic
>
> Dear experts,
>
> I’ve a multicast financial market connected to my infrastructure, I’ve
> been
> informed that a new data multicast flow could reach up to 6 Gbs, so an
> huge
> amount of traffic needs to be replicated.
>
> Market is connected to an ASR 1001, than to a C6807-XL and customers
> are
> connected to C6500.
>
> ASR1001 is running 15.3(3)S1 and currently has a license for 2.5Gbs (to
> be
> upgrade)
>
> C6807 has Supervisor Engine 2T 10GE and IOS 15.1(2)SY4
>
> C6500 has Supervisor Engine 720 10GE and IOS 12.2(33)SXI5
>
> I’d like to understand in your experience if the mentioned
> infrastructure
> could suffer in performance or throughput or other, having to replicate
> the
> mentioned amount of traffic.
>
> Thanks in advance for any feedback
>
> Cheers
>
> James
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