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• RIP
• RIPv2
administrative distance is120
• IGRP
• EIGRP
administrative distance is90
• OSPF
administrative distance is110
• ISIS
administrative distance is115
• BGP
administrative distance is200
• RIP ----------- 120
• RIPv2
• IGRP --------100
• IEGRP ------90
• OSPF --------110
• ISIS ------115
• BG ----- Internal BG -----200 and External BG----20
120=RIP
120= RIPv2
100= IGRP
90= EIGRP
110= OSPF
115= ISIS
IBGP and EBGP= BGP
IBGP=200
EBGP=20
RIP -120
RIPv2 -120
IGRP-100
IEGRP-90
OSPF -110
ISIS -115
BGP -200
Cisco Routers support many dynamic routing protocols for learning routes in a complex network topology. The routing protocols supported are the following:
Each routing protocol has its own Administrative Distance (AD), which is a value representing the trustworthiness of the specific routing protocol. If a router learns a destination route from two or more routing protocols, it selects the route from the protocol having the smallest Administrative Distance.
The table below shows the default AD values for each routing protocol:
200
Now, if the router learns a specific destination route from both OSPF and RIP, it will select the route learned from OSPF because this protocol has a smaller AD compared to RIP (110 instead of120).
well the question is great and many people here answered correctly, but this vary from one vendor to another since here we are talking about cisco yeah it's correct but for juniper for an example the administrative distance is called the default preference and it is different from cisco A.D for example the static routes in juniper takes a vaule of5 while in cisco the AD of static is1. not to mention these values can be tweaked and tuned.
RIPV1 RIPV2 RIPng ===>120
OSPF OSPFV3 ========>110
IGRP ==========>100
EIGPR (internal) ===>90 and EIGRP (External) ===>170 and EIGRP (Summery route) ==>5
ISIS ====>115
BGP (internal) ===>200 BGP (External) ==>20
RIP-RIPV2=120
IGRP=100
EIGRP=90/170
OSPF=110
IS-IS=115
BGP=200/20
RIP120
RIPv2 same as RIP
IGRP100
EIGRP(not IEGRP)90
OSPF110
IS-IS (ISIS scares :) )115
BGP200
• RIP ---------------------->120
• RIPv2 ------------------>
• IGRP-------------------->100
• IEGRP------------------>90
• OSPF ------------------>110
• ISIS -------------------->115
• BGP ------------------->200