Hi! I've been troubleshooting today MTU issues on my new MX80 router (actually MX5) with Junos 11.4R1.14. I have noticed that MTU of interfaces differs if I set trunks with old-style or new-style configuration.
Documentation http://www.juniper.net/techpubs/en_US/junos11.4/topics/example/layer-2-bridge-domain-environment-example-interfaces-and-vlans-mx-solutions.html does not mention it, but with a interface-mode you have to manually set MTU 4 bytes larger or add "vlan-tagging" option. Is this a bug in Junos or documentation is incomplete? On EX4200 with interface-mode I did not need to add/change anything. Please take a closer look at ae1 interface: root@KR-020-r1# show ae0 description "### KR-011-s1 ###"; vlan-tagging; encapsulation extended-vlan-bridge; aggregated-ether-options { lacp { active; periodic fast; } } inactive: unit 0 { family bridge { interface-mode trunk; vlan-id-list [ 708 206 ]; } } unit 206 { vlan-id 206; } unit 708 { vlan-id 708; } [edit interfaces] root@KR-020-r1# show ae1 description "### KR-020-s1 ###"; aggregated-ether-options { lacp { active; periodic fast; } } unit 0 { family bridge { interface-mode trunk; vlan-id-list [ 708 206 ]; } } [edit interfaces] root@KR-020-r1# show ae2 description "### KR-020-s2 ###"; mtu 1518; aggregated-ether-options { lacp { active; periodic fast; } } unit 0 { family bridge { interface-mode trunk; vlan-id-list [ 708 206 ]; } } [edit interfaces] root@KR-020-r1# show ae3 description "### KR-020-s3 ###"; vlan-tagging; aggregated-ether-options { lacp { active; periodic fast; } } unit 0 { family bridge { interface-mode trunk; vlan-id-list [ 708 206 ]; } } [edit interfaces] root@KR-020-r1# run show interfaces ae0 | grep MTU Link-level type: Extended-VLAN-VPLS, MTU: 1518, Speed: 2Gbps, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled, Protocol bridge, MTU: 1518 Protocol bridge, MTU: 1518 Protocol multiservice, MTU: Unlimited [edit interfaces] root@KR-020-r1# run show interfaces ae1 | grep MTU Link-level type: Ethernet, MTU: 1514, Speed: Unspecified, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled, Protocol bridge, MTU: 1514 [edit interfaces] root@KR-020-r1# run show interfaces ae2 | grep MTU Link-level type: Ethernet, MTU: 1518, Speed: 2Gbps, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled, Protocol bridge, MTU: 1518 [edit interfaces] root@KR-020-r1# run show interfaces ae3 | grep MTU Link-level type: Ethernet, MTU: 1518, Speed: Unspecified, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled, Protocol bridge, MTU: 1518 Protocol multiservice, MTU: Unlimited [edit interfaces] root@KR-020-r1# Regards, Dawid _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
