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Answer» Following are the differences between hard reset and soft reset in the context of BGP: | Basis | Hard Reset | Soft Reset |
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| Goal | The TCP session with the BGP neighbour is killed by Hard Reset, and it must be restarted. It terminates the TCP connection between the peers, re-establishes the connection with a BGP open message, and resumes normal peer-to-peer message exchanges. | There are TWO types of soft resets: 1. Soft reset with Route refresh: A soft reset with Route refresh allows BGP peers to seek an update without destroying the neighbour relationship. 2. Soft-reconfiguration: Because the route-refresh request is not issued to the BGP neighbour, soft-reconfiguration stores a copy of BGP routes SENT in the BGP update from our peer. |
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| Direction | The direction of connection in hard reset can be both in and out. | The direction of connection in soft reset is either in or out. |
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| Utilization of memory | It does not necessitate any additional RAM to store another table. | It necessitates more RAM because the router now stores two BGP tables for each neighbour instead of one. |
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| Impact | The hard reset has the potential to DRASTICALLY impair network connectivity | Only those prefixes affected by the policy change will be affected by the soft reset. |
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| Use Case | When a soft reset fails to resolve the problem, a hard reset should be utilised as a final resort. | The soft technique is the most popular and widely employed. |
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| Prerequisite | There are no requirements for this activity. | In soft reset with the Route refresh functionality, both peers MAY be required to provide the Route Refresh capability. |
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| Rate Of Convergence | Because processing the entire table takes a lengthy time, it necessitates an extremely long convergence time. | Its convergence time is significantly less than that of a hard reset. |
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| Commands Used | clear ip bgp {* | neighbor ip | peer-group} | clear ip bgp {neighbor ip} soft out clear ip bgp {neighbor ip} soft in |
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