Configure ACLs using Atomic Programming in Cisco Nexus 7000

This lab has been completed on Nexus 7010 with the following hardware and software installed, you can take a look at Cisco Nexus 7000 user accounts and RBAC in my previous post.

In this task, we will configure ACLs using the atomic programming feature of Cisco NX-OS
Software. In addition, we will investigate the method used to modify, validate, and re-sequence ACLs.

Step 1 On your N7K switch creates two object-groups, one named ALLOWSUBNETS and the other BADPORTS.

Step 2 Exit global configuration mode and reenter using the configure session command.
Name our session ACL-CHECKER
N7K11-pod3# configure session ACL-CHECKER

Step 3 Create an IP access list named BIG-ACL.
N7K11-pod3(config-s)# ip access-list BIG-ACL

Step 4 Assign the object-groups named ALLOWSUBNETS and BADPORTS created in Step 1 above to the IP access list BIG-ACL.
N7K11-pod3(config-s-acl)# permit ip addrgroup ALLOWNETS any
N7K11-pod3(config-s-acl)# deny tcp any port-group BADPORTS any

Step 5 Add the following deny statements to the access list named BIG-ACL.
N7K11-pod3(config-s-acl)# deny tcp 10.200.10.0/24 any
N7K11-pod3(config-s-acl)# deny tcp 10.200.11.0/24 any
N7K11-pod3(config-s-acl)# deny tcp 10.200.12.0/24 any
N7K11-pod3(config-s-acl)# deny tcp 10.200.13.0/24 any
N7K11-pod3(config-s-acl)# exit

Step 6 Assign the IP access list BIG-ACL to the port channel interface within our pod
VDC in the ingress direction.
N7K11-pod3(config-s)# interface port-channel 1

N7K11-pod3(config-s-if)# ip access-group BIG-ACL in
N7K11-pod3(config-s-if)# exit

Step 7 Step 7 Verify the configuration session ACL-CHECK.
N7K11-pod3(config-s)# verify
Verification Successful

Step 8 If the operation in Step 7 was successful, then commit the session to the running
configuration.
N7K11-pod3(config-s)# commit
Commit Successful

We can check our access-list just configured by ” show access-list BIG-ACL”. Also, we can insert multiple sequences in between our access-list sequence, here we will insert sequences 11 to 19 between 10 and 20.

We can resequence the ACL also by using “resequence ip access-list BIG-ACL [start-seq] [end-seq]” and we can verify our new restructured ACL.

We can use several Show commands like “show ip access-list”, ” sh access-list”to check our configuration like “, one cool command is “Show running-config aclmgr”

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Afroz Ahmad

My name is Afroz. I am a CCIE, and I have been working in Networking Industry for more than 14 years. Currently, I work as a Network Designer for a large Organization. I write about technical topics and challenges a Network engineer faces in day-to-day life in my blog. I love to teach people, and I believe in the simple concept that teaching makes you a better learner.

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