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11.5.1 Configuration algorithm
Step Description Command Keys
1 Configure BGP precedence for the main
routing table (optional).
esr(config)# ip protocols bgp
preference <VALUE>
<VALUE> – protocol
precedence, takes values in the
range of [1..255].
Default value: BGP(170).
2 Configure the BGP routing table
capacity (not required when using the
global routing table).
esr(config)# ip protocols bgp max-
routes <VALUE>
<VALUE> – amount of BGP
routes in the routing table,
takes values in the range of:
for ESR-1000/1200/1500
/1511/1700/3100 –
[1..5000000];
for ESR-20/21/100/200
– [1..2500000];
for ESR-10/12V(F)/14VF
– [1..1000000].
The default value for the global
routing table:
for ESR-1000/1200/1500
/1511/1700/3100 –
[5000000];
for ESR-20/21/100/200
– [2500000];
for ESR-10/12V/12VF/
14VF – [1000000].
Default value for VRF: 0.
esr(config)# ipv6 protocols bgp
max-routes <VALUE>
esr(config-vrf)# ip protocols bgp
max-routes <VALUE>
esr(config-vrf)# ipv6 protocols bgp
max-routes <VALUE>
3 Enable the output of BGP neighbor
state information (optional).
esr(config)# router bgp log-
neighbor-changes
esr(config)# ipv6 router bgp log-
neighbor-changes
4 Enable ECMP and define the maximum
amount of equal routes to a destination
point.
esr(config)# router bgp maximum-
paths <VALUE>
<VALUE> – amount of valid
equal routes to the target, takes
the values of [1..16].
3 Select the filtering method for the
information transmitted between
routers. (Mandatory when configuring
eBGP to announce subnets)
To establish a BGP session it is necessary to allow TCP port 179 on the firewall.
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