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ESR Series Routers Operation Manual
To apply configuration changes, execute the following commands:
esr#
commit
Configuration has been successfully committed
esr#
confirm
Configuration has been successfully confirmed
When settings are applied, traffic will be encapsulated into the tunnel and sent to the partner
regardless of their GRE tunnel existence and settings validity.
Alternatively, you may specify the following parameters for GRE tunnel:
Enable GRE header checksum calculation and inclusion into a packet with encapsulated packet
for outbound traffic:
esr(config-gre)#
local checksum
Enable check for GRE checksum presence and validity for inbound traffic:
esr(config-gre)#
remote checksum
Specify a unique identifier:
esr(config-gre)#
key 15808
Specify DSCP, MTU, TTL values:
esr(config-gre)#
dscp 44
esr(config-gre)#
mtu 1426
esr(config-gre)#
ttl 18
To view the tunnel status, use the following command:
esr#
show tunnels status gre 10
To view sent and received packet counters, use the following command:
esr#
show tunnels counters gre 10
To view the tunnel configuration, use the following command:
esr#
show tunnels configuration gre 10
IPv4-over-IPv4 tunnel configuration is performed in the same manner.
During tunnel creation, you should enable GRE protocol (47) in the firewall.