How Block Port And Protocol In Cisco Device

https://networkengineering.stackexchange.com/questions/44196/close-port-80-443-on-cisco-switch
https://www.cisco.com/c/en/us/support/docs/ip/access-lists/26448-ACLsamples.html#anc10
https://community.cisco.com/t5/switching/access-list-to-block-port/td-p/1168090
https://learningnetwork.cisco.com/s/question/0D53i00000Kstkt/how-to-use-acl-to-block-port-443-and-80-on-sw-catalyst-2960-poe
https://community.cisco.com/t5/switching/need-to-block-udp-port-10006-on-cisco-cat-2950/td-p/1433478

BGP summry

Use a network statement to advertise the summary address

https://www.cisco.com/E-Learning/bulk/public/tac/cim/cib/using_cisco_ios_software/cmdrefs/auto-summary.htm

  1. Auto-summary: a router summaries its locally-originated BGP networks to their classful boundaries. Also, all reditributed subnets (into BGP, if a router has) will be summarized to their classful boundaries into BGP table.
  2. Synchronization: If your AS is a transit AS, synchronization prevents a BGP speaker from advertising a route to an EBGP peer until all routers within the speaker’s AS have learned about the route via an IGP.

https://networkengineering.stackexchange.com/questions/44563/bgp-no-auto-summary-and-no-synchronization-configuration