Cisco vs. Juniper

Command list

Cisco Command	Juniper Command	Co-Ordinating Definition
show ip interface brief	show interface terse	displays the status of interfaces configured for IP
show interface [intfc]	show interfaces [intfc] detail	displays the interface configuration, status and statistics.
show controller intfc	show interfaces intfc extensive	displays information about a physical port device
show interface / incl (proto/Desc)	show interfaces description	displays the interface configuration, status and statistics
show ip route	show route	displays summary information about entries in the routing table
show ip bgp summary	show bgp summary	displays the status of all Border Gateway Protocol (BGP) connections
show ip bgp net mask	show route protocol bgp prefix	will show you how that route is being advertised, look for the first line
show ip bgp net mask longer-prefixes	show route range prefix	will show you how that route is being advertised, look for the first line
show ip bgp regexp AS-regexp	show route aspath-regexp “AS-regexp”	displays routes matching the autonomous system (AS) path regular expression
show ip bgp neighbors neigh received-routes	show route receive-protocol bgp neigh / show route source-gateway neigh protocol bgp	Shows whether a neighbor supports the route refresh capability
show ip bgp neighbor neigh advertised-routes	show route advertising-protocol bgp neigh	Shows whether a neighbor supports the route refresh capabilty
show clns neighbors	show isis adjacency	displays both ES and IS neighbors
show clns interface	show isis interface	shows specific information about each interface
show ip route isis	show isis routes	displays the current state of the the routing table
show isis topology	show isis spf	displays a list of all connected routers in all areas
show ip ospf interface	show ospf neighbor	shows neighbor ID, Priority, IP, & State if the neighbor router, dead time.
show ip ospf interface	show ospf interface	shows neighbor id, pri, state, dead time, address and interface
show ip route ospf	show ospf route	display the current state of the routing table
show ip ospf database	show ospf database	display list of information related to the OSPF database for a specific communication server
show version	show version, show system uptime	display the system hardware config., software version, and name and source of configuration files and boot images
show diags	show chasis hardware	displays power-on diagnostics status
show processes cpu	show system process	displays utilization statistics
show tech-support	request support info	displays the current software image, configuration, controllers, counters, stacks, interfaces, memory and buffers
show logging	show log messages	display the state of logging to the syslog
show route-map name	show policy name	displayall route-maps configured or only the one specified
show ip prefix-list name	show policy name	display information about a prefix list or prefix list entries
show ip community-list list	configure, show policy-options community name	display routes that are permitted by BGP community list
show environment all	show chassis environment	displays temperature and voltage information on the console
ping dest	ping dest rapid (for cisco like output) / ping dest (for unix like output)	to check to see if a destination is alive
ping (setting source int)	ping dest bypass-routing	to check to see if a destination is alive
terminal monitor	monitor start messages	Change console terminal settings
terminal no monitor	monitor stop	Change console terminal settings
terminal length 0	set cli screen-length 0	sets the length for displaying command output

OSPF

Some subtle differences Because OSPF has several checks and balances in regards to neighbor adjacencies, and because those adjacencies are essential for actual routing, their defaults remain the same between the two vendors. These include authentication (except in the case of OSPFv3), hello/dead intervals and area types. One note about authentication: in Cisco IOS when area authentication (either MD5 or Simple) is configured at the protocol level it triggers the bit in the AuType field within the header. This means that without a like configuration on neighboring routers, adjacencies will not be created. Juniper does not, at the protocol level, trigger the AuType bit unless the key is configured within the interface.

In the examples below, both configurations will change the AuType to 2 which would satisfy one of the adjacency requirements. Of course if we were trying to get these two to “neighbor-up” it wouldn't work.

Cisco Example

 router ospf 1
 area 0.0.0.0 authentication message-digest
 end

Juniper Example

 protocols ospf {
      area 0.0.0.0 {
           authentication-type md5;
      interface ge1/0/1.0{
           authentication  {  
                md5 1 key juniper;
   }
   } 
   }
 }

Another difference lies within the functions of stub ABRs. This is a classic difference between routers made for enterprise operations and routers made for the provider industry. In Cisco IOS a stub router which is configured to either allow summary route or inject just one summary (totally stubby) will do just that. In Juniper land, that particular function is optional and must be configured using the “default-metric” command.

On broadcast/multi-access media such as Ethernet, OSPF elects a Designated Router (DR) to act as the originator of network advertisements and synchronizing of link-state databases. The election process involves the comparison of OSPF priority values and Router-IDs. On a data link the highest priority wins the election. Each vendor has a default priority and each vendor recognizes that a priority of 0 does not allow that interface to be considered in an election. Cisco has a default priority of 1 and Juniper has a default of 128. This means of course, that if you put Cisco and Juniper on the same broadcast segment, Juniper will by default become the designated router.