Juniper JUNOS - NETWORK OPERATION GUIDE REV1 User Manual

JUNOS Internet Software Network Operations Guide: Hardware
154 ! Verifying Routing Engine Failure
Step 3: Understand What Happens When Memory Failures Occur
Most Juniper Networks Routing Engines support Error Checking and Correction
(ECC) protected memory. There are two types of memory errors: single-bit and
multiple-bit.
A single-bit error is when a single 0 or 1 bit is incorrect. The system detects and
corrects single-bit errors, then logs the event in the
/var/log/eccd file. If there are
persistent single-bit errors, the Routing Engine controller reboots the Routing
Engine. Persistent single-bit errors could be a symptom of bad RAM.
Multiple-bit errors are when multiple bits are incorrect. By default, if a multiple-bit
error is detected, a nonmaskable interrupt (NMI) is generated to interrupt the
Routing Engine and panic the kernel causing the router to subsequently reboot. The
Routing Engine panics the kernel, and leaves a vmcore file.Multi-bit parity error
detection was implemented in JUNOS software release 5.3 and above.
Step 4: Check the Router File System and Boot Disk
Action Ta b l e 4 3 specifies the storage media by Routing Engine type. The device names are
displayed when the router boots. To display the Routing Engine type on some
routers, use the
show chassis hardware CLI command.
Table 43: Storage Media Device Names
Action
To check the router file system and on which disk the router booted, use the
following CLI command:
user@host> show system storage
Sample Output user@host> show system storage
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/ad0s1a 65687 26701 33732 44% /
devfs 16 16 0 100% /dev/
/dev/vn1 9310 9310 0 100% /packages/mnt/jbase
/dev/vn2 8442 8442 0 100%
/packages/mnt/jkernel-5.0R5.1
/dev/vn3 11486 11486 0 100% /packages/mnt/jpfe-5.0R5.1
/dev/vn4 5742 5742 0 100% /packages/mnt/jroute-5.0R5.1
/dev/vn5 1488 1488 0 100%
/packages/mnt/jcrypto-5.0R5.1
/dev/vn6 792 792 0 100% /packages/mnt/jdocs-5.0R5.1
mfs:181 762223 3 701243 0% /tmp
/dev/ad0s1e 25263 7 23235 0% /config
procfs 4 4 0 100% /proc
/dev/ad1s1f 7156052 337194 6246374 5% /var
Storage Media
RE-M40
(RE1)
RE-400
(RE5)
RE-333 (RE2)/
RE-600 (RE3)
RE-1600
(RE4)
Flash drive
ad0 ad0 ad0 ad0
Hard disk
ad2 ad1 ad1 ad1
Removable media
afd0 ad3 ad3
ad3
and ad4

Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Specifications

General

Brand	Juniper
Model	JUNOS - NETWORK OPERATION GUIDE REV1
Category	Software
Language	English