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Cisco Ios Admin Distances & Juniper Junos Route Preferences

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Unit 4 Cisco IOS Admin Distances & Juniper JUNOS Route Preferences
• The values between juniper and Cisco are very similar. The default values are a little slower with Juniper in some areas such as IS-IS and OSPF (intermediate system to immediate system and open shortest path first).
• The OSPF routes (open shortest path first) in Cisco has no hop count limitations. The external for Cisco (EBGP) is 20 compares to Junos (BGP) with 170. Cisco is lower because it goes out as a AS instead of staying as a AS. The IBGP is 200 because of its internal route should be a IGP. The BGP prefers the paths learned by using the EBGP over paths learned using IBGP to eliminate loops.
• distance Bgp 200
• default-metric 4
This table lists the administrative distance default values of the protocols
Route Source Default Distance Values
Connected interface 0
Static route 1
Enhanced Interior Gateway Routing Protocol (EIGRP) summary route 5
External Border Gateway Protocol (BGP) 20
Internal EIGRP 90
IGRP 100
OSPF 110
Intermediate System-to-Intermediate System (IS-IS) 115
Routing Information Protocol (RIP) 120
Exterior Gateway Protocol (EGP) 140
On Demand Routing (ODR) 160
External EIGRP 170
Internal BGP 200
Unknown* 255

Default Route Preference Values
How Route Is Learned Default Preference Statement to Modify Default Preference
Directly connected network 0 -
System routes 4 -
Static 5 Static
MPLS 7 MPLS preference in the JUNOS MPLS Applications Configuration Guide
LDF 8 LDF preference in the JUNOS MPLS Applications Configuration Guide
OSPF internal route 10 OSPF export
IS-IS Level 1 internal route 15 IS-IS external-preference, preference
IS-IS Level 2 internal route 18 IS-IS external-preference, preference
Default 20 -
Redirects 30 -
Kernel 40 -
SNMP 50 -
Router Discovery 55 -
RIP 100 RIP preference
RIPng 100 RIP preference
PIM 105 JUNOS...

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