I have been looking a bit on PACL and VACL but I am not sure I am looking at the right technology here. I was trying to figure out if I could apply a ACL so that I only permit a specific protocol to be trunc'et through a trunc between two interfaces. It is a pvlan interface which is only used for net-backup so I would like to ensure that we only have these protocols flowing between the switches. I have a nexus 5020 in the one end and a CAT3750 in the other - can I ensure this through some sort of ACL applied to a trunk interface?
Well ACLs are typically used on [Inbound|Outbound] parts of interface vlans or interfaces with ip addresses associated with them. I know that you can use a VACL for permit and or deny specific protocols from the same vlan, since you can't use a regular ACL to create this. Is there a backup server that is responsible for backing up certain systems, and are all the other systmes on the same vlan or different vlans?
the backup-server is assigned to the host-port (pvlan 550) on the pvlan on another switch (in fact 2-3 switches away) - so to stop traffic from flowing into the traffic-path as close as possibly to the originating system I would see if I could apply a acl only permitting the needed protocols on the trunk interconnecting this switch with the rest - try to see the sketch here below:
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