05-09-2019 03:58 AM
Hi,
I have a one chassis Catalyst 6504-E with 2 x SUP-720-10G working in SSO mode. My understanding was that the supervisor WAN interfaces are only configurable on the active supervisor and they are replicated to the standby supervisor. It looks like I can configure all the WAN interfaces on both supervisors independently. Can it be done that WAN interfaces are configured only on the active supervisor and their configuration is a mirror to the WAN interfaces on the standby supervisor?
The requirement here is that I have 2 carriers (running BGP with same ASN to both of them) and one carrier is active and the second carrier is my backup. So only one WAN interface should be active at a time (the one on the active sup). So to speak the active carrier would be connected to the active supervisor and the backup carrier should be connected to the standby supervisor.
Can it be achieved this way?
Thanks for any clues and suggestions.
Remy
05-09-2019 04:32 AM
05-09-2019 06:51 AM - edited 05-09-2019 06:52 AM
Thanks Mark for your comments. Yes, the uplinks are configured as routed L3 ports. So there is no way to configure the 2 supervisors in a way that the standby supervisor would be the mirror of the active one? Say in a similar way like ASA Active-Standby?
Regards,
05-09-2019 08:24 AM
05-09-2019 08:58 AM
Thank you Mark. Yes I had the same thought to go with EEM and already did some test. Here I would need to have one EEM script for when the primary carrier goes down to switch over to the secondary carrier and another EEM script for when an active supervisor goes down. It's the question of catching the right syslog messages. I wonder when the secondary supervisor takes over the active role will it be able to still execute EEM scritp once it became active? Once I think I ran some EEM script with the time delay and based on a syslog message that should help.
Best regards,
Remy
05-09-2019 11:39 AM
05-10-2019 08:06 AM
True and it would be interesting to verify that in the lab. The carriers will connect directly to the supervisors so no other switch option in front of the chassis. I will test that and let you know. Although running BGP with the carriers and prioritize them also would be an option. Once tested in the lab I will let you know, I bed you are curious if the EEM would work in this scenario.
Regards,
Remy
05-09-2019 09:11 AM
Hi,
The requirement here is that I have 2 carriers (running BGP with same ASN to both of them) and one carrier is active and the second carrier is my backup. So only one WAN interface should be active at a time (the one on the active sup). So to speak the active carrier would be connected to the active supervisor and the backup carrier should be connected to the standby supervisor.
Can it be achieved this way?
The only way that this might work is by using a layer-3 Portchannle where you have one link from the primary sup and one from the standby sup in the same channel group but for this, to work you have to talk to your provider to do the same on their side. So, it would be one layer-3 Portchannel with one /30 IP. Note that layer-3 Portchannel is supported on the 6500 but not sure about the ports on the sups. This is something you would have to test. A better solution would be to have each circuit going to a different router with one /30 for each connection, EBGP with the service provider and IBGP between the 2 chassis.
HTH
05-09-2019 09:13 AM
Thank you for your suggestions, I will test that.
05-09-2019 09:17 AM
BTW, these are not necessarily "WAN" interfaces, there are simply 10Gig Ethernet ports that can be used for anything. (WAN, LAN, layer-2, layer-3, connecting to servers, etc..).
HTH
05-09-2019 09:21 AM
Correct. I simply used here term WAN interfaces as for they purpose in this configuration and as they connect directly with the carrier. Thanks.
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