Why the last AS PATH item always is `I` or `?`? [duplicate]How to understand the output below from BGP?Measuring route processing timeWhy would you want to prevent customer routes being advertised to certain peers?wrong BGP AS number transmittedUnexpected AS-PATH ACL behaviorWhy Connected Routes are not shown as RIB failure in BGP Table?Does the Router running multi routing protocol progresses received the routes will store into the Forwarding table?All routes about a IP in my Router AS-PATH last AS number is IdleTraceroute doesn't show one hop?Juniper router how to check the BGP process port?Why Cisco BGP neighbor command need the remote-as number?
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Why the last AS PATH item always is `I` or `?`? [duplicate]
How to understand the output below from BGP?Measuring route processing timeWhy would you want to prevent customer routes being advertised to certain peers?wrong BGP AS number transmittedUnexpected AS-PATH ACL behaviorWhy Connected Routes are not shown as RIB failure in BGP Table?Does the Router running multi routing protocol progresses received the routes will store into the Forwarding table?All routes about a IP in my Router AS-PATH last AS number is IdleTraceroute doesn't show one hop?Juniper router how to check the BGP process port?Why Cisco BGP neighbor command need the remote-as number?
This question already has an answer here:
How to understand the output below from BGP?
2 answers
you see my snapshot from m Juniper Router, I want to find the routes of 114.114.114.114, but there always get Idle or a ?, why:
router bgp juniper
asked 2 days ago
244boy244boy
4038
marked as duplicate by Sebastian, Teun Vink♦ yesterday
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
This question already has an answer here:
How to understand the output below from BGP?
2 answers
you see my snapshot from m Juniper Router, I want to find the routes of 114.114.114.114, but there always get Idle or a ?, why:
router bgp juniper
asked 2 days ago
244boy244boy
4038
marked as duplicate by Sebastian, Teun Vink♦ yesterday
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
This question already has an answer here:
How to understand the output below from BGP?
2 answers
you see my snapshot from m Juniper Router, I want to find the routes of 114.114.114.114, but there always get Idle or a ?, why:
router bgp juniper
asked 2 days ago
244boy244boy
4038
This question already has an answer here:
How to understand the output below from BGP?
2 answers
you see my snapshot from m Juniper Router, I want to find the routes of 114.114.114.114, but there always get Idle or a ?, why:
This question already has an answer here:
How to understand the output below from BGP?
2 answers
router bgp juniper
router bgp juniper
asked 2 days ago
244boy244boy
4038
asked 2 days ago
244boy244boy
4038
asked 2 days ago
244boy244boy
4038
asked 2 days ago
244boy244boy
4038
asked 2 days ago
244boy244boy
4038
4038
marked as duplicate by Sebastian, Teun Vink♦ yesterday
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
marked as duplicate by Sebastian, Teun Vink♦ yesterday
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
This tells you how this prefix was learned by BGP.
This is an attribute called origin, which may help BGP decide the preferred path to take (if all higher weight attributes are tied - local-preference, weight, as-path etc.)
"I"- tells you the NLRI was introduced into BGP directly using the "network" command (Not sure why its referred to as "IGP", if someone knows please leave a comment).
"?"- tells you the NLRI was redistributed into BGP from another protocol.
answered 2 days ago
sergeyrarsergeyrar
616110
add a comment |
"I" Represented IGP. That mean iBGP is being used.
Internal Border Gateway Protocol (iBGP) is a term used to describe an area of BGP operation that runs within an organization or autonomous system. Internal BGP is a method employed to provide more information to your internal routers. iBGP could be said to be one of the peers of BGP routers.
answered 2 days ago
serverAdmin123serverAdmin123
1005
New contributor
serverAdmin123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Not true, it does not mean iBGP
– sergeyrar
2 days ago
can you explain??
– serverAdmin123
2 days ago
IGP != iBGP (BGP is EGP)
– sergeyrar
2 days ago
add a comment |
I try to answer this question :-
For a route to be announced by BGP , there is a condition that must be satisfied which is that the 'route' must be present in the routing table of originating router. If a 'route' is present in the routing table of router , then it can advertise that route via BGP.
Now router can know about that 'route' via Interior Gateway Protocol. In this case we can use network command (or prefix list in Juniper and then call that prefix list in export policy) to announce that route to other peer. In this case when this router advertise this route it set 'I' with that route meaning that the route was known to Router via Interior Gateway Protocol in AS (it may be OSPF , IS-IS , EIGRP).
Now for the case of '?' against BGP routes which comes with possibility that your router has learnt that route but it doesn't know the source of that 'route'. Meaning 'route' has been redistributed from IGP to some other IGP (like from OSPF to ISIS). In that case , router will think that ' I don't know how originally announce / own this route in the IGP domain as it has been redistributed . Again you can use network or (prefix list in Juniper and then call that prefix list in export policy) to advertise that route to other peers. But in this when the router advertise this route it set '?' to prefix it advertise to other peers.
answered 2 days ago
NABEEL NASIRNABEEL NASIR
1748
add a comment |
3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
This tells you how this prefix was learned by BGP.
This is an attribute called origin, which may help BGP decide the preferred path to take (if all higher weight attributes are tied - local-preference, weight, as-path etc.)
"I"- tells you the NLRI was introduced into BGP directly using the "network" command (Not sure why its referred to as "IGP", if someone knows please leave a comment).
"?"- tells you the NLRI was redistributed into BGP from another protocol.
answered 2 days ago
sergeyrarsergeyrar
616110
add a comment |
This tells you how this prefix was learned by BGP.
This is an attribute called origin, which may help BGP decide the preferred path to take (if all higher weight attributes are tied - local-preference, weight, as-path etc.)
"I"- tells you the NLRI was introduced into BGP directly using the "network" command (Not sure why its referred to as "IGP", if someone knows please leave a comment).
"?"- tells you the NLRI was redistributed into BGP from another protocol.
answered 2 days ago
sergeyrarsergeyrar
616110
add a comment |
This tells you how this prefix was learned by BGP.
This is an attribute called origin, which may help BGP decide the preferred path to take (if all higher weight attributes are tied - local-preference, weight, as-path etc.)
"I"- tells you the NLRI was introduced into BGP directly using the "network" command (Not sure why its referred to as "IGP", if someone knows please leave a comment).
"?"- tells you the NLRI was redistributed into BGP from another protocol.
answered 2 days ago
sergeyrarsergeyrar
616110
This tells you how this prefix was learned by BGP.
This is an attribute called origin, which may help BGP decide the preferred path to take (if all higher weight attributes are tied - local-preference, weight, as-path etc.)
"I"- tells you the NLRI was introduced into BGP directly using the "network" command (Not sure why its referred to as "IGP", if someone knows please leave a comment).
"?"- tells you the NLRI was redistributed into BGP from another protocol.
answered 2 days ago
sergeyrarsergeyrar
616110
answered 2 days ago
sergeyrarsergeyrar
616110
answered 2 days ago
sergeyrarsergeyrar
616110
answered 2 days ago
sergeyrarsergeyrar
616110
616110
add a comment |
add a comment |
"I" Represented IGP. That mean iBGP is being used.
Internal Border Gateway Protocol (iBGP) is a term used to describe an area of BGP operation that runs within an organization or autonomous system. Internal BGP is a method employed to provide more information to your internal routers. iBGP could be said to be one of the peers of BGP routers.
answered 2 days ago
serverAdmin123serverAdmin123
1005
New contributor
serverAdmin123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Not true, it does not mean iBGP
– sergeyrar
2 days ago
can you explain??
– serverAdmin123
2 days ago
IGP != iBGP (BGP is EGP)
– sergeyrar
2 days ago
add a comment |
"I" Represented IGP. That mean iBGP is being used.
Internal Border Gateway Protocol (iBGP) is a term used to describe an area of BGP operation that runs within an organization or autonomous system. Internal BGP is a method employed to provide more information to your internal routers. iBGP could be said to be one of the peers of BGP routers.
answered 2 days ago
serverAdmin123serverAdmin123
1005
New contributor
serverAdmin123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Not true, it does not mean iBGP
– sergeyrar
2 days ago
can you explain??
– serverAdmin123
2 days ago
IGP != iBGP (BGP is EGP)
– sergeyrar
2 days ago
add a comment |
"I" Represented IGP. That mean iBGP is being used.
Internal Border Gateway Protocol (iBGP) is a term used to describe an area of BGP operation that runs within an organization or autonomous system. Internal BGP is a method employed to provide more information to your internal routers. iBGP could be said to be one of the peers of BGP routers.
answered 2 days ago
serverAdmin123serverAdmin123
1005
New contributor
serverAdmin123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
"I" Represented IGP. That mean iBGP is being used.
Internal Border Gateway Protocol (iBGP) is a term used to describe an area of BGP operation that runs within an organization or autonomous system. Internal BGP is a method employed to provide more information to your internal routers. iBGP could be said to be one of the peers of BGP routers.
answered 2 days ago
serverAdmin123serverAdmin123
1005
New contributor
serverAdmin123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 2 days ago
serverAdmin123serverAdmin123
1005
New contributor
serverAdmin123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 2 days ago
serverAdmin123serverAdmin123
1005
answered 2 days ago
serverAdmin123serverAdmin123
1005
1005
New contributor
serverAdmin123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
serverAdmin123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
serverAdmin123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Not true, it does not mean iBGP
– sergeyrar
2 days ago
can you explain??
– serverAdmin123
2 days ago
IGP != iBGP (BGP is EGP)
– sergeyrar
2 days ago
add a comment |
Not true, it does not mean iBGP
– sergeyrar
2 days ago
can you explain??
– serverAdmin123
2 days ago
IGP != iBGP (BGP is EGP)
– sergeyrar
2 days ago
Not true, it does not mean iBGP
– sergeyrar
2 days ago
Not true, it does not mean iBGP
– sergeyrar
2 days ago
can you explain??
– serverAdmin123
2 days ago
can you explain??
– serverAdmin123
2 days ago
IGP != iBGP (BGP is EGP)
– sergeyrar
2 days ago
IGP != iBGP (BGP is EGP)
– sergeyrar
2 days ago
add a comment |
I try to answer this question :-
For a route to be announced by BGP , there is a condition that must be satisfied which is that the 'route' must be present in the routing table of originating router. If a 'route' is present in the routing table of router , then it can advertise that route via BGP.
Now router can know about that 'route' via Interior Gateway Protocol. In this case we can use network command (or prefix list in Juniper and then call that prefix list in export policy) to announce that route to other peer. In this case when this router advertise this route it set 'I' with that route meaning that the route was known to Router via Interior Gateway Protocol in AS (it may be OSPF , IS-IS , EIGRP).
Now for the case of '?' against BGP routes which comes with possibility that your router has learnt that route but it doesn't know the source of that 'route'. Meaning 'route' has been redistributed from IGP to some other IGP (like from OSPF to ISIS). In that case , router will think that ' I don't know how originally announce / own this route in the IGP domain as it has been redistributed . Again you can use network or (prefix list in Juniper and then call that prefix list in export policy) to advertise that route to other peers. But in this when the router advertise this route it set '?' to prefix it advertise to other peers.
answered 2 days ago
NABEEL NASIRNABEEL NASIR
1748
add a comment |
I try to answer this question :-
For a route to be announced by BGP , there is a condition that must be satisfied which is that the 'route' must be present in the routing table of originating router. If a 'route' is present in the routing table of router , then it can advertise that route via BGP.
Now router can know about that 'route' via Interior Gateway Protocol. In this case we can use network command (or prefix list in Juniper and then call that prefix list in export policy) to announce that route to other peer. In this case when this router advertise this route it set 'I' with that route meaning that the route was known to Router via Interior Gateway Protocol in AS (it may be OSPF , IS-IS , EIGRP).
Now for the case of '?' against BGP routes which comes with possibility that your router has learnt that route but it doesn't know the source of that 'route'. Meaning 'route' has been redistributed from IGP to some other IGP (like from OSPF to ISIS). In that case , router will think that ' I don't know how originally announce / own this route in the IGP domain as it has been redistributed . Again you can use network or (prefix list in Juniper and then call that prefix list in export policy) to advertise that route to other peers. But in this when the router advertise this route it set '?' to prefix it advertise to other peers.
answered 2 days ago
NABEEL NASIRNABEEL NASIR
1748
add a comment |
I try to answer this question :-
For a route to be announced by BGP , there is a condition that must be satisfied which is that the 'route' must be present in the routing table of originating router. If a 'route' is present in the routing table of router , then it can advertise that route via BGP.
Now router can know about that 'route' via Interior Gateway Protocol. In this case we can use network command (or prefix list in Juniper and then call that prefix list in export policy) to announce that route to other peer. In this case when this router advertise this route it set 'I' with that route meaning that the route was known to Router via Interior Gateway Protocol in AS (it may be OSPF , IS-IS , EIGRP).
Now for the case of '?' against BGP routes which comes with possibility that your router has learnt that route but it doesn't know the source of that 'route'. Meaning 'route' has been redistributed from IGP to some other IGP (like from OSPF to ISIS). In that case , router will think that ' I don't know how originally announce / own this route in the IGP domain as it has been redistributed . Again you can use network or (prefix list in Juniper and then call that prefix list in export policy) to advertise that route to other peers. But in this when the router advertise this route it set '?' to prefix it advertise to other peers.
answered 2 days ago
NABEEL NASIRNABEEL NASIR
1748
I try to answer this question :-
For a route to be announced by BGP , there is a condition that must be satisfied which is that the 'route' must be present in the routing table of originating router. If a 'route' is present in the routing table of router , then it can advertise that route via BGP.
Now router can know about that 'route' via Interior Gateway Protocol. In this case we can use network command (or prefix list in Juniper and then call that prefix list in export policy) to announce that route to other peer. In this case when this router advertise this route it set 'I' with that route meaning that the route was known to Router via Interior Gateway Protocol in AS (it may be OSPF , IS-IS , EIGRP).
Now for the case of '?' against BGP routes which comes with possibility that your router has learnt that route but it doesn't know the source of that 'route'. Meaning 'route' has been redistributed from IGP to some other IGP (like from OSPF to ISIS). In that case , router will think that ' I don't know how originally announce / own this route in the IGP domain as it has been redistributed . Again you can use network or (prefix list in Juniper and then call that prefix list in export policy) to advertise that route to other peers. But in this when the router advertise this route it set '?' to prefix it advertise to other peers.
answered 2 days ago
NABEEL NASIRNABEEL NASIR
1748
answered 2 days ago
NABEEL NASIRNABEEL NASIR
1748
answered 2 days ago
NABEEL NASIRNABEEL NASIR
1748
answered 2 days ago
NABEEL NASIRNABEEL NASIR
1748
1748
add a comment |
add a comment |
