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bgp_tcp_mss_path_mtu
Github Action edited this page Jun 10, 2024
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- Validate changes in TCP MSS value is allowed and takes effect.
- Validate DUT's PMTUD compliance.
- ATE:port1 <-> port1:DUT1:Port2 <-> port1:DUT2
- Establish BGP sessions as follows:
- ATE:port1 --- eBGP-IPv4/IPv6 ---- DUT1:port1.
- ATE:port1 ---- iBGP IPv4 ---- DUT2:port1.
- Verify that the default TCP MSS value is set below the default interface MTU value.
- Change the Interface MTU on the DUT1:port1 port as well as ATE:port1 to 5040B
- Configure IP TCP MSS value of 4096 bytes on the DUT1:port1.
- Re-establish the EBGP sessions by tcp reset.
- Verify that the TCP MSS value is set to 4096 bytes for the IPv4 and IPv6 EBGP sessions.
- Establish iBGP session with MD5 enabled between ATE:port1 and DUT2:port1.
- Ensure that the MTU on the DUT1:port1 towards ATE1:port1 is left at default (1500B) while the ATE1:port1 interface towards DUT1:port1 is set at 5040B. Please also make sure that the DUT2:port1 MTU is set at 5040B as well.
- Enable PMTUD on DUT2:port1.
- Re-establish the IBGP sessions by tcp reset.
- Validate that the min MSS value has been adjusted to be below 1500 bytes on the tcp session.
- /neighbors/neighbor/transport/config/tcp-mss
- /neighbors/neighbor/transport/config/mtu-discovery
- /neighbors/neighbor/transport/state/tcp-mss
- /neighbors/neighbor/transport/state/mtu-discovery
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