Can any explain what is the defferent between BGP and ISIS? And how to use it?

yWX511501 · Created Dec 24, 2018 03:50:09

1.The routing table on the ISP network is very large. There are tens of thousands or even 100000 routes. Currently, there are more than 400000 routes on the global Internet. In the case of a large number of routes, IS-IS is more efficient than OSPF.
2.OSPF has more routing control functions than IS-IS. Standard IS-IS does not have the route filtering function. OSPF is more complex than IS-IS, for example, multiple areas, multiple protocol data packets, and multiple circuit types. In the case of the ISP, IS-IS is used only as an IGP that carries BGP. The IS-IS protocol is simple, stable, and scalable. IS-IS meets the preceding requirements. In addition, only IS-IS supports some advanced features on the MPLS network.
3.ISIS is based on TLV, and OSPF is not. One advantage of TLV is that it is easy to extend.

yWX511501 · Created Dec 24, 2018 03:50:09

1.The routing table on the ISP network is very large. There are tens of thousands or even 100000 routes. Currently, there are more than 400000 routes on the global Internet. In the case of a large number of routes, IS-IS is more efficient than OSPF.
2.OSPF has more routing control functions than IS-IS. Standard IS-IS does not have the route filtering function. OSPF is more complex than IS-IS, for example, multiple areas, multiple protocol data packets, and multiple circuit types. In the case of the ISP, IS-IS is used only as an IGP that carries BGP. The IS-IS protocol is simple, stable, and scalable. IS-IS meets the preceding requirements. In addition, only IS-IS supports some advanced features on the MPLS network.
3.ISIS is based on TLV, and OSPF is not. One advantage of TLV is that it is easy to extend.

yWX511501 · Created Dec 24, 2018 04:31:19

1.ISIS is igp protocol. BGP is devided into IBGP and EBGP, they are both EGP protocol.
2.IGP is overlay protocol of BGP
3.IGP is running in AS.
4.BGP is running between ASs.
isis configuration example:
isis 1
is-level level-2
cost-style wide
network-entity 49.0012.0000.0000.0001.00
interface Serial1/0/1
isis enable 1
IBGP configuration example:
AR1
bgp 10
peer 10.1.15.13 as-number 10
AR2
bgp 10
peer 10.1.15.1 as-number 10

Mysterious.color · Created Dec 24, 2018 06:42:40

BGP is external protocol
ISIS is internal

Can any explain what is the defferent between BGP and ISIS? And how to use it?

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Can any explain what is the defferent between BGP and ISIS? And how to use it?

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