Network design
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Cisco IOS21
show ip route summary- Counts routes by source (connected, static, OSPF, BGP) and the memory they use. A quick check that summarization works and of how large the table is getting.
show ip protocols- Shows each routing process with router ID, networks, passive interfaces, redistribution, filters, distance and routing sources. A fast audit of the routing design on one device.
show ip ospf border-routers- Lists the ABRs and ASBRs this router has routes to, with area and next hop. Confirms the area design and which routers inject external routes.
show ip bgp summary- Lists BGP neighbors with AS, uptime and prefixes received. A number in the last column means Established; a word such as Active or Idle means the session is down.
show standby brief- One line per HSRP group with priority, preempt flag, state, active and standby routers and virtual IP. Check that the active router matches the STP root for that VLAN.
show vrrp brief- One line per VRRP group with priority, state and master address. Confirms the master is the switch the design intended.
show track- Shows each tracked object, what it watches, its state, how often it changed, and which clients such as static routes, HSRP or VRRP depend on it.
show ip sla statistics- Shows the latest result, return code and success and failure counts per IP SLA operation. Older IOS releases used show ip sla monitor statistics.
show spanning-tree root- Lists the root bridge ID, root cost, timers and root port for every VLAN, so you can confirm the root sits where the design says it should.
show etherchannel summary- Shows each port channel, its protocol and member ports with flags such as P (bundled), I (stand-alone) and s (suspended). Proves uplinks are bundled, not blocked.
show switch- Lists Catalyst stack members with role (active, standby, member), priority, MAC address and state. Confirms the stack and its election match the design.
show redundancy- Shows the redundancy mode (for example SSO), the state of the active and standby supervisor or stack member, and switchover history.
show power inline- Shows PoE per port and the PoE budget in watts (available, used, remaining). Confirms a closet can power all its APs, phones and cameras.
show inventory- Lists chassis, modules, power supplies and optics with product IDs and serial numbers. The input for support contracts, spares and end-of-life tracking.
show lldp neighbors detail- Shows LLDP neighbors with system name, port, management address and capabilities, to draw or verify the physical diagram. show cdp neighbors detail is the Cisco-only equivalent.
show interfaces summary- One line per interface with queue drops and current receive and transmit rates in bits and packets per second. A quick capacity scan of a whole switch.
copy running-config flash:pre-change.cfg- Saves the running config to a file before a change, giving configure replace a known-good target and the post-check a baseline to compare with.
show archive config differences flash:pre-change.cfg system:running-config- Shows the line-by-line differences between the saved pre-change file and the running config. A clean post-change review of exactly what changed.
configure replace flash:pre-change.cfg list- Replaces the running config with the saved file by applying only the differences, and lists each command applied. The cleanest rollback after a failed change.
configure terminal revert timer 10- Enters config mode with automatic rollback. Unless you enter configure confirm within 10 minutes, the device reverts. Needs the archive feature with a path configured.
reload in 10- Schedules a reload in 10 minutes as a safety net before a risky remote change. Do not save the config until it is proven, then run reload cancel.
NX-OS1
show vpc brief- Shows vPC domain status, peer link, peer keepalive, consistency checks and each vPC's state. The first check of an MLAG design on Nexus switches.
Arista EOS1
configure session CUTOVER-1- Opens a named configuration session on Arista EOS. Changes stay pending until commit; show session-config diffs shows them and abort discards them.
Junos2
commit confirmed 5- Activates the candidate config but rolls it back automatically after 5 minutes unless you commit again. The standard safety net for remote changes on Junos.
show system commit- Lists recent commits with time, user and method. Pairs with rollback n in configuration mode to return to an earlier configuration.