SUMMARY:
SYMPTOMS:
CAUSE:
Continue reading “How to configure and verify the DHCP relay for EX-series switches”
insidetech…"
SUMMARY:
SYMPTOMS:
CAUSE:
Continue reading “How to configure and verify the DHCP relay for EX-series switches”
Integrated routing and bridging (IRB) interfaces enable a switch to recognize which packets are being sent to local addresses so that they are bridged whenever possible and are routed only when needed. Whenever packets can be switched instead of routed, several layers of processing are eliminated. Switching also reduces the number of address look-ups.
Note: In versions of Junos OS that do not support Enhanced Layer 2 Software (ELS), this type of interface is called a routed VLAN interface (RVI). |
To configure the routed VLAN interface:
[edit]
user@switch# set vlans support vlan-id 111
[edit]
user@switch# set interfaces ge-0/0/18 unit 0 family ethernet-switching vlan members support
[edit]
user@switch# set interfaces irb unit 111 family inet address 10.0.0.0/8
[edit]
user@switch# set vlans support l3-interface irb.111
Note: If you are using a version of Junos OS that does not support ELS, you create a Layer 3 virtual interface named vlan |
This article describes the issue of a system booting from the backup root partition after a file corruption occurs on the primary root partition. This article is targeted for SRX and EX devices at this time.
EX switches and SRX firewalls running Junos Release 10.4R3, or later, have added resiliency based on the “resilient dual-root partition”, which if the switch detects a corruption on the primary root file system, it boots from the alternate root partition.
When this occurs, you are notified in two ways: Alarm and Warning Banner
The following alarm message is generated:
user@switch> show chassis alarms
1 alarms currently active
Alarm time Class Description
2011-02-17 05:48:49 PST Minor Host 0 Boot from backup root
***********************************************************************
** **
** WARNING: THIS DEVICE HAS BOOTED FROM THE BACKUP JUNOS IMAGE **
** **
** It is possible that the primary copy of JUNOS failed to boot up **
** properly, and so this device has booted from the backup copy. **
** **
** Please re-install JUNOS to recover the primary copy in case **
** it has been corrupted. **
** **
***********************************************************************
It is likely that the file system became corrupted due to a sudden power loss, or ungraceful shutdown of the system.
Repairing the primary partition when it is corrupted:
Note: As long as both of the partitions are healthy, there is no issue with running the switch on either of them. You only have to ensure that both the partitions are healthy, so that fail over can be done transparently between the two partitions, in case of any file corruption.
Continue reading “Recovering System Booted From Backup JUNOS Image”