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--- networking:arista_eos [2026/01/13 11:50] – created v1ctor
+++ networking:arista_eos [2026/04/10 08:25] (current) – [DEFAULTING ALL INTERFACES] v1ctor
@@ Line 1: / Line 1: @@
 ====== EOS ======
-Verify checksum:
+==== CHECKSUM ====
 <code>
 # verify /sha512 flash:SMART-eMMC-fw-0x20-v1_0_0.swix
 </code>
+==== CONFIG SESSIONS ====
+<code bash>
+# commit
+# abort                             // discard all the changes and exit config session
+#show session-config diffs          // diff
+#show session-config named NAME_1   // shows session config
+</code>
+Example diff:
+<code bash>
+-hostname AMS30-LAB-7280-01         // "-" - what's in the startup-config
++hostname R1                        // "+" - what's in the running-config
+</code>
+==== RESTORE ====
+<code>
+Aboot#fullrecover                   // Erases everything
+</code>
+==== SCHEDULER ====
+<code>
+schedule clear_evpn_blacklist interval 5 timeout 1 max-log-files 1 command clear bgp evpn host-flap
+</code>
+==== SCP ====
+Allow SCP:
+<code>
+username Admin privilege 15 secret root123
+aaa authorization exec default local
+</code>
+Example copying to Arista switch using an SCP:
+<code>
+scp EOS-4.21.5F.swi admin@192.168.160.102://mnt/flash/EOS-4.21.5F.swi
+</code>
+==== EOS UPGRADE ====
+<code>
+localhost(config)#boot system flash:EOS-4.32.3M.swi
+localhost(config)#exit
+localhost#
+localhost#show boot-config
+Software image: flash:/EOS-4.32.3M.swi
+</code>
+==== SECRET BOOT IMAGE ====
+<code>
+/mnt/flash/.boot-image.swi
+Aboot# boot /mnt/flash/.boot-image.swi
+</code>
+==== PORT SECURITY ====
+To delete an address from the port security MAC cache, the address must be removed from the forwarding database prior to executing the “clear port-security” command:
+<code>
+Arista# no mac address-table static 0000.aaaa.bbbb vlan 52 interface ethernet 4/1/1
+Arista# clear port-security interface Ethernet 4/1/1
+</code>
+==== EXTENSIONS ====
+<code>
+#dir extension:  // folder where you need to put an extension
+#extension WORD  // installing an extension
+#show extensions // show installed extensions
+#copy installed-extensions boot-extensions // make it permanent
+</code>
+==== TCPDUMP ====
+  * Only control plane!
+  * But, we can redirect some data plane traffic to the CPU :)
+<code>
+monitor session 1 source Ethernet1/1
+monitor session 1 destination Cpu
+</code>
+==== DEFAULTING ALL INTERFACES ====
+<code>
+default interface ethernet 1-$
+</code>
+==== LOGING USING CERTIFICATE ====
+<code>
+Arista(config)#username <user> privilege 15 secret <secret password>     # Create account
+Arista(config)#username <user> sshkey file flash:testkey.pub             # Associate the SSH key
+</code>
+Generate certificate and upload it on the switch:
+<code bash>
+$ ssh-keygen -t ecdsa -b 521 -f aristakey
+$ scp aristakey.pub admin@leaf-ams://mnt/flash/aristakey.pub
+</code>
+Verify connectivity:
+<code bash>
+ssh -i aristakey Arista
+</code>